Back to Study: Glycine ingestion improves subjective sleep qualit...
causal
neutral effect
Taking 3 grams of glycine before bed doesn't change how much time people spend in different sleep stages (light sleep, deep sleep, REM sleep).
Scientific Claim
A single 3g dose of glycine before bedtime does not significantly alter sleep architecture (proportions of sleep stages) in adults with chronic poor sleep.
Source Excerpt
“The sleep architecture, that is, the ratios of each sleep stage length in the whole sleep period, was not altered by glycine ingestion (Fig. 5)”
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 sleep architecture and found no statistically significant changes in the proportions of sleep stages after glycine ingestion compared to placebo. This provides causal evidence that glycine doesn't alter sleep architecture.