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correlational
positive effect
Taking 3 grams of glycine before bed might help people who have trouble sleeping spend more time actually sleeping compared to time in bed, according to sleep monitoring equipment.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with improved sleep efficacy (sleep time/in-bed time) in individuals with chronic sleep dissatisfaction, 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.”