Taking 3 grams of glycine before bed might help people spend more time actually sleeping compared to time spent in bed, based on sleep monitoring.
Scientific Claim
Ingestion of 3 grams of glycine before bedtime is associated with increased sleep efficacy (sleep time divided by in-bed time) 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 design (cohort study) cannot establish causation, but the abstract uses 'improved' which implies causation. The correct verb strength should be 'associated with increased' or 'linked to higher'.
Evidence from Studies
No evidence studies found yet.