The Washington PostDemocracy Dies in Darkness

This $10 purchase can improve your sleep and boost your brain health

Research has shown that even relatively dim light when we snooze — about the equivalent of a hallway light — can have surprisingly profound physiological effects

An illustration of a person wearing a pink sleeping mask, covered in darkness with just their face showing.
(Illustration by George Wylesol for The Washington Post)
6 min

Your bedroom is probably not as dark as it should be. Even through closed eyelids, light streaming from the television or hallway can make its way into our retinas and harm our health and mental acuity the next day.

The deleterious health effects of nighttime light exposure are staggering.

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