Back to Study: Glycine ingestion improves subjective sleep qualit...
causal
positive effect
Taking 3 grams of glycine before bed makes people feel less sleepy at 10 AM the next day.
Scientific Claim
A single 3g dose of glycine before bedtime significantly reduces daytime sleepiness at 10:00 AM in adults with chronic poor sleep as measured by Visual Analog Scale (P=0.009).
Source Excerpt
“glycine reduced daytime sleepiness (P=0.009)”
Evidence from Studies
Supporting Studies
Glycine ingestion improves subjective sleep quality in human volunteers, correlating with polysomnographic changes
Crossover Trial
View study →30%
Evidence Assessment
Supported
The study measured daytime sleepiness using VAS and found a statistically significant reduction at 10:00 AM (P=0.009) after glycine ingestion compared to placebo in a randomized crossover design. This provides causal evidence for glycine's effect on daytime alertness.