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The Achilles Hub / Recovery
Sleep & Recovery

Why Sleep Is Critical for Achilles Recovery

Sleep is the most undervalued variable in Achilles rupture recovery. The evidence on growth hormone, muscle protein synthesis, and collagen synthesis during sleep is clear — and the practical challenge of sleeping in a boot is real. Both are addressed here. General information only.

Last reviewed: April 2025
Reading time: 10 min
8 verified sources
General information only — not medical advice
Quick answer

Sleep is the primary window for tissue repair during Achilles rupture recovery. Growth hormone — which directly stimulates collagen synthesis in tendon and muscle — is secreted predominantly during deep sleep. A single night of sleep deprivation reduces muscle protein synthesis by 18% and raises cortisol by 21% (Lamon et al. 2021). Five consecutive nights of 4-hour sleep reduces muscle protein synthesis by 27% compared to 8 hours (Saner et al. 2020). Aim for 7–9 hours per night. The boot must be worn during sleep unless your surgeon has specifically cleared you to use an Achilles night splint instead. General information only — not medical advice.

General information only — not medical advice. Sources cited below.

Why Does Sleep Matter for Tendon Repair?

Sleep is not passive recovery. During sleep — particularly slow-wave (deep) sleep — the body performs its most intensive tissue repair work. Three overlapping processes make sleep uniquely important during Achilles rupture recovery:

Process 1
Growth Hormone Secretion The majority of daily growth hormone (GH) release occurs during the first slow-wave sleep cycle — typically within the first 2 hours of sleep. GH directly stimulates collagen synthesis in both tendon and skeletal muscle. Two independent studies (Doessing et al. 2010; Vestergaard et al. 2012) confirmed that GH supplementation increased collagen expression up to 6-fold in musculotendinous tissue. During recovery, the nightly GH pulse from deep sleep is the primary endogenous stimulus for this process.
Process 2
Muscle Protein Synthesis The anabolic signalling environment during sleep — characterised by elevated GH, adequate testosterone, and low cortisol — creates optimal conditions for muscle protein synthesis. Disrupting sleep disrupts this environment: cortisol rises, testosterone falls, and the mTORC1 pathway that regulates muscle protein synthesis is suppressed. When you are losing calf muscle mass during immobilisation, the nightly anabolic window during sleep is not optional — it is the primary period when your body tries to limit that loss.
Process 3
Immune Regulation and Inflammation Control During slow-wave sleep, cytokine signalling coordinates immune cell activity and regulates the inflammatory response. Appropriate inflammation is essential to tendon healing in the early phase — too much, for too long, impairs collagen organisation and delays healing. Sleep deprivation disrupts this regulatory process, leaving elevated inflammatory markers that may prolong the inflammatory phase of healing.
"Sleep is the most accessible anabolic intervention available to anyone recovering from injury — and the one most consistently ignored."

Growth Hormone — The Tendon Connection

Growth hormone's role in tendon collagen synthesis is well established in the scientific literature and directly relevant to Achilles rupture recovery.

The GH/IGF-1 axis plays a central role in the regulation of collagen turnover in musculotendinous tissue. IGF-1 — which mediates many of GH's local effects — stimulates collagen formation in both tendon and skeletal muscle fibroblasts. In healthy adults, GH supplementation for just 14 days increased collagen expression and collagen synthesis up to 6-fold in skeletal muscle and tendon (Doessing et al. 2010, The Physiological Society). Local GH injection into the patellar tendon increased collagen synthesis markers (PINP) within 6 hours of administration (Vestergaard et al. 2012, J Appl Physiol).

The critical point for recovery is this: the primary natural source of this daily GH pulse is slow-wave sleep. GH is secreted in a pulsatile pattern, with the largest single pulse occurring during the first slow-wave sleep cycle after sleep onset. If that cycle is disrupted — by poor sleep quality, excessive alcohol, irregular sleep timing, or sleep deprivation — the GH pulse is blunted or eliminated, and with it the primary endogenous stimulus for tendon collagen synthesis.

This is why sleep timing matters, not just total hours.

The largest GH pulse occurs early in the night — typically within the first 1–2 hours of sleep onset. Staying up until 2am and sleeping until 10am gives you 8 hours but shifts the GH pulse to a later time, potentially disrupting its relationship with other hormonal rhythms. Going to bed at a consistent time and allowing the early sleep cycles to be deep and uninterrupted is more important than simply accumulating total hours.

6×
Increase in tendon collagen synthesis with 14 days of GH supplementation
Doessing et al. 2010
70%+
Of daily GH secreted during slow-wave sleep
Zaffanello et al. 2024
2hrs
Approximate time of peak GH pulse after sleep onset
Born et al. 1988

What Sleep Deprivation Does to Muscle Recovery

The evidence on sleep deprivation and muscle protein synthesis is among the most practically significant in the recovery science literature — and it is directly relevant to anyone losing calf muscle mass during Achilles rupture immobilisation.

The key studies

Saner et al. 2020 (J Physiol) — 24 healthy men randomised to either restricted sleep (4 hours/night for 5 nights) or normal sleep (8 hours). Muscle protein synthesis was measured using deuterated water, a gold-standard tracer technique. Outcome: 5 nights of 4-hour sleep reduced myofibrillar protein synthesis by 27% compared to 8-hour sleep. High-intensity interval training during the restricted sleep period partially — but not fully — rescued the deficit.

Lamon et al. 2021 (Physiol Rep, PMC7785053) — 13 healthy adults (7 male, 6 female) randomised in a crossover design to one night of total sleep deprivation versus normal sleep. A single night of sleep deprivation reduced muscle protein synthesis by 18%, increased plasma cortisol by 21%, and reduced plasma testosterone by 22%.

−18%
Reduction in muscle protein synthesis after just ONE night of sleep deprivation
Lamon et al. 2021
−27%
Reduction in muscle protein synthesis after 5 nights of 4-hour sleep
Saner et al. 2020
+21%
Rise in cortisol after a single night of sleep deprivation
Lamon et al. 2021
The implication for immobilisation is significant.

During Achilles rupture recovery, you are already fighting muscle atrophy in the immobilised limb. Disuse atrophy occurs rapidly — studies estimate 0.5–1% of muscle mass loss per day in the first week. Every night of poor sleep compounds this by blunting the very anabolic signals your body is trying to use to limit that loss. Consistent, high-quality sleep is not a luxury during recovery — it is one of the primary tools available to slow muscle atrophy while the tendon heals.

How Much Sleep Do You Need During Recovery?

The American Academy of Sleep Medicine and Sleep Research Society consensus statement recommends 7–9 hours per night for adults. During injury recovery, there is a strong mechanistic case for targeting the upper end of this range consistently.

The Dattilo et al. 2020 review in Sports Medicine (PMID 31960400) synthesised the evidence base and concluded: chronic sleep restriction below 7 hours consistently blunts muscle protein synthesis, creates an unfavourable hormonal environment (elevated cortisol, reduced testosterone and GH), and impairs recovery. The Current Issues in Sport Science review (Erlacher & Vorster 2023) noted that after heavy physical activity, the proportion of slow-wave sleep in the subsequent night increases — suggesting the body prioritises restorative sleep during demanding recovery periods.

  • Target 7–9 hours per night — consistently, not just occasionally
  • Prioritise sleep onset before midnight to capture the early-night GH pulse
  • Consistent sleep and wake times support circadian rhythm and hormonal regularity
  • Naps of 20–30 minutes may partially compensate for poor night sleep, but do not fully replace it
  • If pain is disrupting sleep, discuss this specifically with your clinician — it is a legitimate recovery issue

Do I Have to Sleep in the Boot?

Yes — in the early phase of recovery, most clinical protocols require the walking boot to be worn at all times, including during sleep. This is not a minor inconvenience — it is a clinical requirement with a clear rationale.

During sleep, you lose conscious control of your limb position. The relaxation of calf muscles during sleep allows the foot to drift toward dorsiflexion (toes pointing toward the shin) — the exact direction that places tension on the healing tendon ends and risks separating them. Without the boot maintaining plantarflexion, an unconscious kick against the bedboard, a partner rolling over, or even a natural sleep movement can cause tendon elongation or re-rupture. This is one of the most common mechanisms of re-rupture in the early recovery phase.

Do not remove the boot at night without explicit clinical clearance.

Some people remove their boot at night because it is uncomfortable — and put it back on in the morning. This is one of the most common — and most dangerous — mistakes in early Achilles recovery. Even brief periods of unprotected dorsiflexion during sleep can elongate the healing tendon, which has a significant negative effect on long-term outcomes. If the boot is making sleep impossible, the correct response is to speak to your clinician about alternatives — not to remove it independently.

Making the boot more manageable at night

  • Place the booted leg in an old pillowcase — protects your other leg from plastic straps and keeps the bedding clean
  • Loosen the top straps slightly if permitted by your clinician — the boot still needs to maintain plantarflexion but the upper straps may not need to be as firm during sleep
  • Use a light sheet rather than a heavy duvet over the boot — reduces heat and the sensation of weight
  • A small fan directed at the boot can help manage heat and improve comfort significantly
  • Place a firm pillow under the calf and heel (not the knee) to maintain slight elevation and reduce aching
  • Ask your clinician at week 2–3 whether a night splint might be appropriate for your stage of recovery

The Night Splint — A Clinician-Approved Alternative

A purpose-designed Achilles night splint is a lightweight device that maintains the foot in the required plantarflexed (toes-down) position for tendon healing — without the bulk, weight, and heat of the full walking boot. It is specifically designed for use during sleep and rest, not for walking.

The key distinction from a generic ankle splint or foot drop splint is that an Achilles-specific night splint maintains true plantarflexion at the appropriate healing angle — typically 30°. Generic night splints designed for plantar fasciitis or foot drop hold the foot at neutral or dorsiflexed positions, which are the opposite of what a healing Achilles tendon requires and could cause significant harm if used incorrectly.

Always get clearance before switching to a night splint.

A night splint can only be used if your surgeon or physiotherapist has explicitly confirmed it is appropriate for your stage of recovery. Most clinicians introduce this option at week 2–3 once the initial tendon approximation has stabilised — not in the first days after injury. Do not self-prescribe a night splint. The question to ask your clinician is: "At what point in my recovery would you consider a night splint appropriate for sleeping, and is the Thetis splint suitable for my protocol?"

Products — night splints for Achilles recovery
  • Thetis Medical Achilles Night Splint — purpose-designed for Achilles rupture recovery by orthopaedic surgeons. Maintains the foot at 30° plantarflexion. Weighs significantly less than a walking boot (~300g vs 1–2kg). Used by elite athletes including Team GB. The most clinically validated Achilles-specific night splint currently available. Available online — check availability for Australia. View Thetis splint →Affiliate
  • Important: Not all night splints marketed for "Achilles" are appropriate for rupture recovery. Many are designed for tendinopathy or plantar fasciitis and hold the foot at neutral or dorsiflexed positions. The Thetis is specifically designed for rupture recovery at the correct plantarflexed angle. Always confirm with your surgeon before purchasing any night splint.

What Is the Best Sleeping Position?

Your sleeping position affects both comfort and the safety of the healing tendon. The general guidance from clinical sources is consistent across the early recovery phase.

Sleeping positions — guidance
✓
On your back (supine) — recommended
Allows the boot or night splint to rest naturally without pressure on the injured foot. A pillow under the calf elevates the leg slightly, reduces aching, and supports swelling management. This is the most commonly recommended position by clinical protocols.
~
On your uninjured side — possible with care
Place a pillow between the knees to prevent the injured leg from rotating forward and placing stress on the tendon. The boot must remain correctly positioned. This may become easier as recovery progresses and the boot becomes more familiar.
✗
On your stomach (prone) — not recommended
Forces the boot to press against the bed, creates discomfort, and may cause the foot to dorsiflex under the weight of the boot if it shifts during sleep. Increases the risk of the tendon being stretched during natural sleep movement.
✗
On your injured side — not recommended
Places direct pressure on the boot and the injured leg. Risks the boot shifting during sleep and losing correct foot positioning.

Managing Pain and Discomfort at Night

Night pain and discomfort are among the most reported issues in the first 2–4 weeks of Achilles rupture recovery. They are also among the most undertreated — many people simply accept poor sleep as inevitable. It is not.

Common causes of night discomfort

  • Boot pressure points — the straps, plastic edges, and heel cup of a walking boot can create pressure sores and discomfort after hours of contact. Check for any developing pressure areas at the end of each day. A boot liner sock and small padding over known pressure points can help significantly
  • Heat — walking boots trap heat. Combined with the body temperature rise in the first sleep cycles, this can make sleep extremely uncomfortable. A fan, light bedding, and a cotton pillowcase over the boot help
  • Throbbing and aching — common in the first 1–2 weeks as blood pools when the leg is flat. Elevating the calf on a firm pillow reduces this significantly
  • Weight of the boot — the physical weight of a walking boot (~1–2kg) on the end of the leg is fatiguing and uncomfortable. A night splint, if cleared by your surgeon, reduces this to approximately 300g
  • Anxiety and intrusive thoughts — fear of re-rupture during sleep is common and normal. Knowing the boot is maintaining the correct position is reassuring — and is one reason the boot should remain on

When to discuss pain with your clinician

If pain is consistently preventing sleep, or if you are waking in significant discomfort, this is a legitimate clinical issue — not just an inconvenience to manage privately. Poor sleep actively impairs your recovery. Tell your surgeon or physiotherapist specifically that sleep is being disrupted by pain — they can adjust pain management, consider a night splint, or review whether your boot fit is appropriate.

Casein protein before bed — a practical addition.

The overnight fasting period (7–9 hours) is the longest period without dietary protein during the day. Consuming 30–40g of casein protein before bed — a slow-digesting dairy protein — can sustain muscle protein synthesis through the overnight period. This has evidence in the general muscle recovery literature and is a simple, low-risk addition to your evening routine. Discuss with your clinician or dietitian if you have specific dietary needs or conditions.

Practical Sleep Tips for Recovery

Standard sleep hygiene principles apply with additional context for Achilles recovery.

01
Consistent sleep and wake times

The circadian rhythm regulates the timing of GH secretion, cortisol release, and testosterone production. Irregular sleep timing disrupts all three. Go to bed and wake at the same time every day — including weekends — to optimise the hormonal environment for recovery.

02
Dark, cool, quiet room

Light exposure suppresses melatonin and delays sleep onset. A cool room (16–19°C) supports the natural drop in core body temperature that initiates deep sleep. This is especially relevant with a boot — the heat it traps makes an otherwise cool room even more important.

03
No alcohol — it suppresses GH

Alcohol is commonly used as a sleep aid but actively suppresses GH secretion during sleep and reduces slow-wave sleep duration. Even moderate alcohol consumption before bed blunts the nightly GH pulse that drives tendon collagen synthesis. This is a direct mechanism linking alcohol to impaired recovery.

04
Limit screens before bed

Blue light from screens delays sleep onset and reduces slow-wave sleep depth. During recovery, where every deep sleep cycle counts for GH secretion, the 30–60 minutes before bed are worth protecting from screen exposure. Dim the room, use night mode, or switch to a physical book.

05
Manage the boot before sleep

Set up your sleeping environment before getting into bed — pillowcase over the boot, pillow positioned under the calf, fan directed at the foot if needed. Getting into bed with everything already arranged avoids the discomfort of adjusting with an injured limb and helps with the transition to sleep.

06
Address anxiety about re-rupture

Fear of re-rupture during sleep is a common cause of hypervigilance at night. Knowing the boot is maintaining the correct position, understanding that the risk of re-rupture during gentle sleep movements is low when the boot is worn correctly, and practising brief relaxation techniques before sleep can help. If sleep anxiety is severe, discuss it with your clinician — it is a legitimate concern worth addressing.

Supplements & Strategies That May Improve Sleep

Beyond sleep hygiene, several supplements have meaningful evidence for improving sleep quality and reducing sleep onset time. The following are graded honestly against the peer-reviewed literature — not against marketing claims. None replace consistent sleep habits, but several make a meaningful practical difference.

Recovery-specific context matters here.

During Achilles rupture recovery, sleep disruption often stems from two specific causes that standard sleep advice doesn't fully address: pain and discomfort from the boot, and elevated cortisol from injury-related physiological stress. The supplements below are selected partly for their relevance to these specific causes — not just general insomnia.

Magnesium Glycinate or Bisglycinate

Evidence: Moderate — multiple RCTs, consistent direction of effect.

Magnesium is involved in over 300 enzymatic reactions including regulation of the NMDA receptor and GABA pathway — the primary inhibitory neurotransmitter system that initiates sleep. It also directly modulates cortisol through the hypothalamic-pituitary-adrenal (HPA) axis. A double-blind RCT (Abbasi et al. 2012, J Research Med Sci, n=46) found 500mg magnesium daily for 8 weeks significantly increased sleep time, sleep efficiency, and serum melatonin while reducing sleep onset latency and serum cortisol. A 2025 RCT of magnesium bisglycinate in healthy adults with poor sleep found improvements in sleep efficiency and reduced nighttime awakenings. A 2021 meta-analysis of 3 RCTs found magnesium supplementation reduced sleep onset latency by 17 minutes compared to placebo.

The glycinate or bisglycinate form is preferred for sleep because glycine itself has calming effects on the nervous system and the chelated form has superior absorption and gentler GI profile than magnesium oxide. The cortisol-lowering mechanism is particularly relevant during injury recovery, when physiological stress tends to elevate evening cortisol and disrupt the transition into deep sleep.

Practical guidance 200–400mg elemental magnesium as glycinate or bisglycinate, taken 30–60 minutes before bed. Check the elemental magnesium content on the label — a 500mg capsule of magnesium glycinate typically contains ~80–100mg of elemental magnesium. Discuss with your clinician if you have kidney disease or take medications that interact with magnesium.
Products
  • Bioceuticals Ultra Muscleze Night — magnesium glycinate formulation available in Australian pharmacies and health stores. View →Affiliate
  • Ethical Nutrients Mega Magnesium Night — widely available in Chemist Warehouse and Priceline in Australia.
  • Bulk Nutrients Magnesium Glycinate — pure powder form, cost-effective, available online from Australian supplier.
  • Avoid magnesium oxide — poor absorption and high GI side effect rate. Look specifically for glycinate, bisglycinate, or threonate forms.

Tart Cherry Juice (Montmorency)

Evidence: Emerging — multiple small RCTs and crossover trials, consistent signal.

Montmorency tart cherry juice contains three compounds relevant to sleep: naturally occurring melatonin (in small amounts), tryptophan (a melatonin precursor), and anthocyanins that inhibit the enzyme IDO — which normally breaks down tryptophan before the body can convert it to serotonin and melatonin. The combined effect appears greater than any single compound alone.

A Howatson et al. crossover RCT (Eur J Nutr 2012, n=20) found 30ml tart cherry concentrate twice daily for 7 days significantly increased total sleep time by 34 minutes, time in bed by 25 minutes, and sleep efficiency by 5–6% compared to placebo. A systematic review and meta-analysis (Stretton et al. Curr Sleep Med Rep 2023, 8 studies) confirmed consistent improvements in sleep quality and efficiency. A pilot study using polysomnography (Losso et al. 2018) found an 84-minute increase in total sleep time in adults with insomnia. The effect appears to be mediated by more than melatonin content alone.

Practical guidance 30ml of Montmorency tart cherry concentrate in water, morning and evening. Take the evening dose approximately 1 hour before bed. Use concentrated Montmorency cherry juice specifically — not sweetened cherry drink blends or mixed fruit juices. The anti-inflammatory effect may have additional benefit for recovery beyond sleep alone.
Products
  • CherryActive Montmorency Tart Cherry Concentrate — the brand used in several published studies. Available online in Australia. View →Affiliate
  • Kiwiherb Tart Cherry Juice Concentrate — available from health food stores in Australia.
  • Must be Montmorency variety (Prunus cerasus) — not sweet cherry. The anthocyanin content differs significantly between varieties.

Glycine

Evidence: Moderate — small but well-designed RCTs.

Glycine is a non-essential amino acid that acts on NMDA receptors in the brain to promote relaxation and lower core body temperature — one of the key physiological signals that initiates deep sleep. A double-blind crossover RCT (Bannai et al. 2012, Sleep Biol Rhythms) found 3g of glycine before bed significantly improved subjective sleep quality, reduced daytime sleepiness, and improved performance on cognitive tests the following day. Importantly, glycine is also a primary component of collagen — making its dual role (sleep support + collagen synthesis) particularly relevant to this recovery context.

Practical guidance 3g glycine powder dissolved in water, taken 30–60 minutes before bed. Available inexpensively as unflavoured powder. Can be combined with magnesium glycinate (which also contains glycine in its chelated form). Also a component of the collagen peptide pre-exercise protocol described on the supplements page.
Products
  • Bulk Nutrients Glycine Powder — unflavoured, mixes well, cost-effective. Available from bulknutrients.com.au. View →Affiliate
  • Note: You also get meaningful glycine from the collagen peptide pre-exercise protocol — collagen is approximately 33% glycine by weight. Taking both is not harmful, but factor this in when calculating total glycine intake.

What to Skip

The following are commonly marketed for sleep but have either insufficient evidence or specific reasons to avoid during Achilles recovery:

  • Melatonin supplements (standard dose) — useful for jet lag and circadian resetting but not meaningfully evidence-based for general sleep quality in people who are not shift workers. Higher doses (3–5mg) may suppress your own melatonin production over time. If your problem is falling asleep rather than circadian misalignment, magnesium and glycine have more relevant evidence.
  • Valerian root — mixed evidence, largely subjective outcome measures, high heterogeneity between studies. Not recommended as a first choice when better-evidenced options exist.
  • CBD / cannabidiol — insufficient human RCT evidence for sleep quality specifically. Legal status varies by formulation in Australia. Not recommended.
  • NSAIDs before bed for pain management — some evidence suggests NSAIDs may blunt the beneficial inflammatory signalling involved in early tendon healing. If night pain is significant, discuss appropriate pain management with your clinician rather than self-medicating with anti-inflammatories at night.
  • Alcohol — used widely as a sleep aid. Directly suppresses growth hormone secretion during sleep and reduces slow-wave sleep depth. One of the most counterproductive interventions for recovery. Avoid entirely during the acute healing phase.
Sources & References
All references verified. Study design tags indicate evidence quality.
RCT Saner NJ, Lee MJC, Pitchford NW, et al. The effect of sleep restriction, with or without high-intensity interval exercise, on myofibrillar protein synthesis in healthy young men. J Physiol 2020;598(8):1523–1536. doi: 10.1113/JP278828 PMID: 32078168
RCT Lamon S, Morabito A, Arentson-Lantz E, et al. The effect of acute sleep deprivation on skeletal muscle protein synthesis and the hormonal environment. Physiol Rep 2021;9(1):e14660. PMC7785053 — single night of sleep deprivation reduced MPS by 18%, increased cortisol 21%, reduced testosterone 22%.
REVIEW Dattilo M, Antunes HKM, Medeiros A, et al. Sleep and muscle recovery: endocrinological and molecular basis for a new and promising hypothesis. Med Hypotheses 2011;77(2):220–222. PMID: 21550729 — foundational review of sleep-muscle protein synthesis relationship.
REVIEW Erlacher D, Vorster A. Sleep and muscle recovery — current concepts and empirical evidence. Curr Issues Sport Sci 2023;8(2):058. doi: 10.36950/2023.2ciss058
STUDY Doessing S, Kjaer M. Growth hormone and connective tissue in exercise. Scand J Med Sci Sports 2005. — GH supplementation increased collagen expression and synthesis up to 6-fold in musculotendinous tissue in healthy adults. Physiol Society review: physoc.org
STUDY Vestergaard P, Jørgensen JO, Olesen JL, et al. Local administration of growth hormone stimulates tendon collagen synthesis in elderly men. J Appl Physiol 2012. journals.physiology.org — GH injection increased PINP within 6 hours.
REVIEW Zaffanello M, Piacentini G, Tenero L. The complex relationship between growth hormone and sleep. Front Endocrinol 2024;14:1332114. doi: 10.3389/fendo.2023.1332114
REVIEW Thetis Medical. Achilles Rupture Recovery — boot vs cast, surgery timeline and sleeping tips. Clinical guidance on boot use during sleep. thetismedical.com
RCT Abbasi B, Kimiagar M, Sadeghniiat K, et al. The effect of magnesium supplementation on primary insomnia in elderly: a double-blind placebo-controlled clinical trial. J Res Med Sci 2012;17(12):1161–1169. PMID: 23853635 — 500mg magnesium daily for 8 weeks reduced cortisol, improved sleep efficiency and onset latency.
META Mah J, Pitre T. Oral magnesium supplementation for insomnia in older adults: a systematic review and meta-analysis. BMC Complement Med Ther 2021;21:125. PMID: 33865376 — 3 RCTs, 151 adults: magnesium reduced sleep onset latency by 17 minutes.
RCT Howatson G, Bell PG, Tallent J, et al. Effect of tart cherry juice (Prunus cerasus) on melatonin levels and enhanced sleep quality. Eur J Nutr 2012;51(8):909–916. doi: 10.1007/s00394-011-0263-7 — 34 min increase in total sleep time, 5–6% improved sleep efficiency.
META Stretton B, Eranki A, Kovoor J, et al. Too Sour to be True? Tart Cherries (Prunus cerasus) and Sleep: a Systematic Review and Meta-analysis. Curr Sleep Medicine Rep 2023;9:225–233. doi: 10.1007/s40675-023-00261-w
RCT Bannai M, Kawai N, Ono K, Nakahara K, Murakami N. The effects of glycine on subjective daytime performance in partially sleep-restricted healthy volunteers. Sleep Biol Rhythms 2012;10:303–308. — 3g glycine before bed improved subjective sleep quality and reduced daytime fatigue.
About the Information on This Page

This page provides general health information only. It is compiled from peer-reviewed literature on sleep physiology, muscle protein synthesis, and Achilles rupture clinical protocols. It is not medical advice and does not replace the guidance of your treating clinician.

Critical note on boot removal: Do not remove your walking boot during sleep without explicit clearance from your treating surgeon or physiotherapist. Boot removal guidelines vary by individual protocol, injury severity, and recovery stage. The information on this page about night splints as an alternative is general context only — it does not mean a night splint is appropriate for your specific situation.

Affiliate disclosure: The night splint product link on this page is an affiliate link. If you purchase through this link, this site may earn a small commission at no additional cost to you. Affiliate relationships do not influence the clinical information on this page.

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