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correlational
positive effect
Taking 3 grams of glycine before bed might help people spend more time actually sleeping compared to the time they spend in bed.
Scientific Claim
In individuals with chronic poor sleep quality, ingestion of 3 grams of glycine before bedtime was associated with increased sleep efficacy (sleep time divided by in-bed time) compared to baseline.
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.”