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correlational
neutral effect
Taking 3 grams of glycine before bed doesn't change sleep stages like sleeping pills do.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with no significant changes in sleep architecture in individuals with chronic unsatisfactory sleep, as measured by polysomnography, while traditional hypnotic drugs such as benzodiazepines typically alter 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. 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.”