Even a little light exposure at night has suggested an increased risk of depression. It has been well-documented that light during sleeping hours can interrupt your internal clock that regulates sleeping and waking, leading to poor sleep quality, but a study published in the American Journal of Epidemiology measured the effect of very low levels of light in relation to symptoms of depression. Other variables such as weight, smoking and drinking, income, medication use, and physical ailments were accounted for when they made conclusions. The group of participants who slept with more than 5 lux of light in their bedroom (for scale, 1 lux is the light of a candle, whereas a typically-lit living room is 50 lux) showed a 65 percent higher chance of being depressed. During a time where many people check phones or tablets as they fall asleep, or sleep with the television on all night, making sure that you are in a truly dark environment is an easy way to improve your mental health while you sleep.

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