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Sleep Quality vs GH Peak Alignment Trade-Off
The argument for evening dosing rests on circadian GH physiology: your largest endogenous growth hormone pulse occurs 60–120 minutes after sleep onset, driven by the interaction between growth hormone-releasing hormone (GHRH) and somatostatin withdrawal during
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- The argument for evening dosing rests on circadian GH physiology: your largest endogenous growth hormone pulse occurs 60–120 minutes after sleep onset, driven by the interaction between growth hormone-releasing hormone (GHRH) and somatostatin withdrawal during slow-wave sleep. By dosing MK-677 60–90 minutes before bed, you theoretically time the peak secretagogue activity to overlap with this natural pulse. Amplifying the signal when your body is already primed to release GH. In theory, this produces a higher net GH output than dosing in the morning when basal secretion is lower. In practice, this calculation ignores the sleep disruption trade-off. Multiple research logs document that evening MK-677 dosing increases sleep latency (time to fall asleep), reduces total time in deep sleep stages, and triggers REM rebound. The vivid, sometimes disturbing dreams that lead users to discontinue within weeks.
- The mechanism: ghrelin and orexin pathways are interconnected. Orexin neurons regulate wakefulness and arousal. When ghrelin receptors are activated (by food scarcity or by exogenous ghrelin analogues like MK-677), orexin activity increases to promote foraging behaviour. This is adaptive in a natural environment. It's disruptive when you're trying to enter REM sleep. The net result: evening dosing may deliver a higher single-night GH output, but if it degrades sleep quality to the point where you're spending less time in slow-wave sleep overall, you're undermining the very process that drives natural GH release. Morning dosing sacrifices the 'perfect alignment' in favour of sustainable nightly deep sleep. Which, across months of use, likely produces better cumulative outcomes than a single amplified pulse followed by fragmented sleep architecture.