Is Blue Light Bad For Sleep?
4 Ways to Stop Blue Light From Ruining a Good Night's Sleep — and Your Circadian Rhythm
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Relatedly, melatonin is a hormone that regulates your circadian rhythm. Blue light actually can neutralise the effects of your naturally-occurring melatonin, which is "usually secreted about two hours prior to one's habitual bedtime," Dr. Buenaver explained. Too much exposure to blue light can throw off that routine and keep your brain on high alert, making it difficult to fall asleep or sleep soundly once you do drift off.