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correlational
positive effect
Taking 3 grams of glycine before bed might help people fall asleep faster and reach deep sleep quicker, but doesn't change how the sleep stages are structured.
Scientific Claim
In individuals with chronic poor sleep quality, ingestion of 3 grams of glycine before bedtime was associated with shortened polysomnographic sleep latency to sleep onset and slow wave sleep without changes in overall sleep architecture.
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.”