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correlational
positive effect

Taking 3 grams of glycine before bed might help people get into deep sleep faster, according to sleep monitoring equipment.

Scientific Claim

Ingestion of 3 grams of glycine before bedtime is associated with reduced latency to slow wave sleep in individuals with chronic unsatisfactory sleep, as measured by polysomnography.

Source Excerpt

Glycine improved subjective sleep quality and sleep efficacy (sleep time/in-bed time), and shortened PSG latency both to sleep onset and to slow wave sleep without changes in the sleep architecture.