Taking 3 grams of glycine before bed makes people who have trouble sleeping feel more satisfied with their sleep.
Scientific Claim
A single 3g dose of glycine taken before bedtime significantly improves subjective sleep satisfaction in adults with chronic poor sleep, as measured by the St. Mary's Hospital Sleep Questionnaire (P=0.046).
Original Statement
“Significant beneficial effects of glycine were revealed in Question 11 'How satisfied were you with last night's sleep?' (P=0.046, Fig. 1)”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The study is a randomized controlled trial (RCT) with statistical significance (P=0.046), which supports causal language. The small sample size is acknowledged in the evidence strength analysis but doesn't invalidate the causal claim for this specific finding.