Back to Study: Glycine ingestion improves subjective sleep qualit...
causal
neutral effect
Taking 3 grams of glycine before bed doesn't change how long it takes to reach REM sleep.
Scientific Claim
A single 3g dose of glycine before bedtime does not significantly affect REM sleep latency in adults with chronic poor sleep.
Source Excerpt
“The latency to rapid eye movement (REM) sleep, however, was not changed.”
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 REM sleep latency and found no statistically significant changes after glycine ingestion compared to placebo. This provides causal evidence that glycine doesn't affect the timing of REM sleep onset.