Is Blue Light Bad For Sleep?
Here's What Blue Light Before Bed Can Do to Your Circadian Rhythm — and How to Avoid It
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Blue Light Suppresses Melatonin
Relatedly, melatonin is a hormone that regulates your circadian rhythm. Blue light actually can neutralize 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.
