Research
Hormonal
Dim light at night disrupts circadian clock gene expression in the hypothalamus and liver, attenuating the amplitude of Per1, Per2, and Rev-Erb rhythms.
Your internal body clock relies on darkness. Dim light at night can weaken the signals that regulate your metabolism, even if you don't feel tired.
GoodSupportsHIGH confidence
exposure to ecologically relevant levels of dim (5 lux) light at night altered core circadian clock rhythms in the hypothalamus at both the gene and protein level.
Why this rating
Detailed molecular analysis with clear statistical support.
Source
Dim Light at Night Disrupts Molecular Circadian Rhythms and Increases Body Weight
Laura K. Fonken et al. · Journal of Biological Rhythms · 2013
DOI 10.1177/0748730413493862
mechanism_only · n=120Cited 306×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
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