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correlational
positive effect
Taking 3 grams of glycine before bed might make people who have trouble sleeping feel like they slept better, based on how they report their sleep.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with improved subjective sleep quality in individuals with chronic sleep dissatisfaction, as measured by self-reported sleep 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.”