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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 spent in bed
Scientific Claim
Glycine ingestion (3 g) before bedtime is associated with increased sleep efficacy (sleep time/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.”