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correlational
positive effect
Taking 3 grams of glycine before bed might make people feel less sleepy during the day, according to their own reports.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with reduced daytime sleepiness in individuals with chronic unsatisfactory sleep, as measured by subjective assessment.
Source Excerpt
“Effects on daytime sleepiness and daytime cognitive function were also evaluated. Glycine lessened daytime sleepiness and improved performance of memory recognition tasks.”