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correlational
neutral effect
Taking glycine before bed doesn't seem to change the overall structure of sleep stages, according to sleep monitoring equipment.
Scientific Claim
Glycine ingestion (3 g) before bedtime was associated with no changes in sleep architecture in individuals with chronic unsatisfactory sleep, as measured by polysomnography.
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.”