prospective cohort study · n=43,722
Association of Bedroom Light at Night With Weight Gain in Women
JAMA Internal Medicine · 2019
Open PubMed recordDOI 10.1001/jamainternmed.2019.0571environment
A little bedroom light does not matter
Grade B · ModerateHuman reviewed
What people say
“A television, lamp, or outdoor light in the room cannot affect my sleep.”
What the evidence says
Grade B · ModerateObservational research links light during sleep with health outcomes, but it cannot prove the light caused them. A darker room is a low-risk environmental experiment, not treatment.
Research record
What this verdict is based on
Sources are linked for inspection. Study results are summarized for general information, not personal medical direction.