systematic review · participant total not stated
The effects of napping on cognitive function and sleep in healthy adults
Sleep Medicine Reviews · 2007
Open PubMed recordDOI 10.1016/j.smrv.2007.07.001timing
Any nap will ruin nighttime sleep
Grade C · LimitedReview pending
What people say
“I should never nap if I want to sleep at night.”
What the evidence says
Grade C · LimitedNap effects depend on duration, timing, prior sleep, and the person. Research does not support treating every nap as harmful, though later or longer naps can reduce sleep pressure.
Research record
What this verdict is based on
Sources are linked for inspection. Study results are summarized for general information, not personal medical direction.