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correlational
neutral effect

Taking 3 grams of glycine before bed doesn't seem to change the overall structure of sleep stages, according to sleep monitoring

Scientific Claim

Glycine ingestion (3 g) before bedtime is associated with no significant changes in sleep architecture 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.