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correlational
positive effect
Taking glycine before bed might help people feel less sleepy during the day, according to sleep monitoring equipment.
Scientific Claim
Glycine ingestion (3 g) before bedtime was associated with reduced daytime sleepiness in individuals with chronic unsatisfactory sleep, as measured by daytime sleepiness assessments.
Source Excerpt
“Effects on daytime sleepiness and daytime cognitive function were also evaluated. Glycine lessened daytime sleepiness and improved performance of memory recognition tasks.”