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Study Suggests Moderate Light During Sleep May Have Negative Health Effects

Not getting a good night’s sleep on a regular basis can lead to brain fog, difficulty concentrating, negative effects on heart health, and mood changes. According to a new study, even moderate light during nighttime sleep may have negative effects on cardiovascular and metabolic health.

20 healthy adults in their 20’s participated in the study. Half of them slept two nights in sleep lab in a darkened room. The other half spent one night in a darkened room and one night in a room with a dim overhead light. The researchers monitored sleep quality, breathing, and heart rate. Insulin resistance was evaluated each morning.

While sleeping in the dimly lit room, participants spent more time in light sleep and less in deep sleep and rapid eye movement sleep. The majority of repair and rejuvenation to the body and mind occur during deep sleep and rapid eye movement sleep stages.

Participants also experienced a higher heart rate when sleeping in the dimly lit room and insulin resistance was higher the next morning.

The study was conducted by researchers from Northwestern University. It was published online ahead of print on March 14, 2022 in the journal PNAS.

Another study found that going to sleep between 10 and 11 at night may provide cardiovascular benefits.

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