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Research Article
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Sleep Cycle Peptide Timing
Growth hormone peaks early in deep sleep, which is why many users dose GH peptides at bedtime. This page covers what sleep studies show and what users report as of October 2026.
Backed by 7 references
Introduction
Users often dose growth hormone (GH) secretagogues at bedtime to match the early-night GH pulse. Our peptide timing overview and meal timing page cover the wider evidence.
Sleep-Related GH Physiology
A 1968 study tied the largest nightly GH peak to deep-sleep onset; in men, both decline sharply by midlife (JAMA, 2000).
Natural GH Release Pattern
| Sleep Stage | GH Release | Timing |
|---|---|---|
| Pre-sleep | Low in most men | Baseline |
| Early sleep (stages 3-4) | Peak release | Starts with deep sleep |
| Later deep sleep | Smaller peaks | Occasional |
Pre-Sleep Dosing Protocols
User and vendor practice, untested as of October 2026.
GH Secretagogues
| Peptide | Timing | Dose | Rationale |
|---|---|---|---|
| Ipamorelin | 30-60 min before bed | 100-300mcg | Adds to the natural pulse |
| CJC-1295 no DAC | With ipamorelin | 100-300mcg | Pairs with ipamorelin |
| GHRP-6 | 30-60 min before bed | 100-300mcg | Hunger may disrupt sleep |
| MK-677 | At bedtime, oral | 10-25mg | Less daytime lethargy |
Considerations
| Factor | What users say |
|---|---|
| Last meal timing | 2-3 hours before sleep dose |
| Sleep quality priority | Sleep over exact timing |
| Fasted vs. fed | Fasted preferred but not essential |
| Consistency | Same time nightly when possible |
Sleep Quality Optimization
Peptides and Sleep
| Effect | Peptide | Evidence |
|---|---|---|
| Better sleep, or restlessness | Ipamorelin/CJC-1295 | User reports |
| Stage 4 sleep up about 50% | MK-677, 25 mg at bedtime | 1997 trial, 8 adults |
| Deep sleep unchanged | GHRP-6, 4 x 50 mcg IV | 1995 study |
| Less deep sleep | Hexarelin, 4 x 50 mcg IV | 2004 study |
| Next-day fatigue | MK-677 | User reports |
Night-Time Protocol Example
A composite of forum and vendor schedules, not a tested protocol.
| Time | Action | Notes |
|---|---|---|
| 6-7 PM | Last full meal | 2-3 hours before dose |
| 9:30 PM | Reported dose time | 30 min before bed |
| 10 PM | Sleep | Consistent schedule |
| 6 AM | Wake | Natural cortisol rise |
Multiple Dose Strategies
| Strategy | Implementation | Reported rationale |
|---|---|---|
| Pre-bed only | Single dose | Simplest |
| Wake + pre-bed | Morning and night | Second fasted pulse |
| 3x daily | Adds a daytime dose | One vendor: 100 mcg each of Mod GRF and ipamorelin, up to 3x |
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References
- Growth hormone secretion during sleep (Takahashi et al., Journal of Clinical Investigation, 1968)
- Interrelationships between growth hormone and sleep (Van Cauter and Copinschi, Growth Hormone & IGF Research, 2000)
- Age-related changes in slow wave sleep and REM sleep and relationship with growth hormone and cortisol levels in healthy men (JAMA, 2000)
- Prolonged oral treatment with MK-677 improves sleep quality in man (Copinschi et al., Neuroendocrinology, 1997)
- Growth hormone-releasing peptide-6 stimulates sleep, growth hormone, ACTH and cortisol release in normal man (Frieboes et al., Neuroendocrinology, 1995)
- Hexarelin decreases slow-wave sleep and stimulates the secretion of GH, ACTH, cortisol and prolactin during sleep in healthy volunteers (Frieboes et al., Psychoneuroendocrinology, 2004)
- When to take CJC-1295 and ipamorelin: morning or night? (Peptides Enhanced vendor guide, 2026)