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correlational
positive effect
Taking 3 grams of glycine before bed might help people sleep better without changing their sleep stages, unlike sleeping pills which do change sleep stages.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with improvements in subjective sleep quality and objective sleep measures in individuals with chronic unsatisfactory sleep, without altering sleep architecture, which may suggest a different mechanism of action compared to traditional hypnotic drugs.
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. Thus, a bolus ingestion of glycine before bedtime seems to produce subjective and objective improvement of the sleep quality in a different way than traditional hypnotic drugs such as benzodiazepines.”