Key Takeaway
Glycine promotes sleep by acting on NMDA receptors in the suprachiasmatic nucleus, causing peripheral vasodilation and core temperature drop.
Summary
This mechanistic study demonstrated that glycine's sleep-promoting effects are mediated through NMDA receptors in the suprachiasmatic nucleus (SCN), the brain's master circadian clock.
Glycine administration caused peripheral vasodilation, leading to heat dissipation and a drop in core body temperature, a critical physiological signal for sleep initiation.
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