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correlational
positive effect

Taking 3 grams of glycine before bed might help people who have trouble sleeping 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 sleep dissatisfaction, as measured by the Stanford Sleepiness Scale.

Source Excerpt

Glycine lessened daytime sleepiness and improved performance of memory recognition tasks.