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correlational
positive effect
Taking 3 grams of glycine before bed might help people spend more time actually sleeping compared to time spent in bed, based on sleep monitoring.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with increased sleep efficacy (sleep time divided by in-bed time) in individuals with chronic sleep dissatisfaction.
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.”