Loading…
Cool is better than warm for sleep onset, but specific °F prescriptions overrun the data.
Cooler rooms aid sleep onset; precise temperature optima depend on bedding and individual physiology.
Our read is Partially Supported. The core mechanism holds and the direction is right, but the popular framing tends to overrun what the trials actually show. With a limited evidence base (58/100) and a working majority (64% consensus), keeping the bedroom at 65–68°F is reasonable for the right person at $15/month — just calibrate the expectation to the data, not the marketing.
Pulled the public claims about keeping the bedroom at 65–68°F from proponents on file (a tracked voice) and weighed them against the more cautious voices in the field, then cross-checked each against the primary trial and cohort literature and the prevailing clinical guidance. We grade the claim against what the human evidence actually supports, not against how confidently it is stated.
Every Sunday: the week’s new conflicts and verdict changes — and nothing else.
Downside risk on keeping the bedroom at 65–68°F is low at sensible doses, but low risk is not no risk: individual response varies, and a low-risk intervention is still only worth it if the benefit is real.
A large, long-duration RCT in a general population that either confirms a hard-outcome benefit or shows the effect washes out once it is properly controlled.
Mechanistic and trial evidence converge on a real, replicable effect.
Benefits hold across the populations where it's been tested.
The effect size is large enough to matter clinically, not just statistically.
Benefits hold across the populations where it's been tested.
Mechanistic and trial evidence converge on a real, replicable effect.
The headline effect shrinks once you account for trial quality.
Confounding and publication bias inflate the apparent benefit.
The headline effect shrinks once you account for trial quality.
Most of the support comes from short or small studies.
Confounding and publication bias inflate the apparent benefit.