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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

Scientific Claim

Glycine ingestion (3 g) before bedtime is associated with improved sleep efficacy (sleep time/in-bed time) in individuals with poor sleep

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.