correlational
Taking 3 grams of glycine before bed might help people who have trouble sleeping fall asleep faster, according to sleep monitoring equipment.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with reduced sleep onset latency as measured by polysomnography in individuals with chronic sleep dissatisfaction.
Original Statement
“Glycine improved subjective sleep quality and sleep efficacy (sleep time/in-bed time), and shortened PSG latency both to sleep onset and to slow wave sleep without changes in the sleep architecture.”
Evidence Quality Assessment
Claim Status
overstated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The study uses 'shortened' which implies causation, but the study design (individual cohort study with unclear randomization and blinding) only supports associative language.
Evidence from Studies
No evidence studies found yet.