One night spent sleeping in a moderately lit room, rather than a dimly lit room, can lead to higher heart rate during the night and insulin resistance the next morning, a small study suggests. 

The study included two groups of 10 healthy adults. One group slept in dimly lit rooms for two consecutive nights and the other slept in dimly lit rooms one night and then moderately lit rooms the next, according to the study, published March 14 in the journal Proceedings of the National Academy of Sciences. The moderately lit rooms were illuminated with a 100 lux overhead light, which is about as bright as it would be on an overcast day, according to The Washington Post

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