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How strong is the evidence for Dark Sleep Environment?

Research on night-time light exposure is supported by a large prospective cohort study linking light exposure at night to higher cardiovascular disease incidence, alongside a microlongitudinal study finding night-to-night associations between light exposure and sleep health, and broader reviews on artificial light at night and circadian disruption. That evidence is currently rated moderate (48/100), built on 6 published studies -- a reasonable base, but not yet enough for full certainty.

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Dark Sleep Environment

Moderate evidence

Evidence

48

Impact

42

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Key studies behind this answer

Light Exposure at Night and Cardiovascular Disease Incidence.Research Support, N.I.H., Extramural · JAMA network open · 2025Sleep, light exposure at night, and psychological wellbeing during pregnancy.Multicenter Study · BMC public health · 2023Night-to-night associations between light exposure and sleep health.Research Support, N.I.H., Extramural · Journal of sleep research · 2023

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