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correlational
positive effect
Taking glycine before bed might help people sleep better, according to both self-reports and sleep monitoring equipment.
Scientific Claim
Glycine ingestion (3 g) before bedtime was associated with improved sleep quality in individuals with chronic unsatisfactory sleep, as measured by polysomnography and subjective assessments.
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.”