Washington CNN —
For thousands of years, the nighttime’s daily darkness naturally told humans it was time to go to sleep. That’s an evolutionary principle embedded into our brains — and it becomes apparent for those who can’t peacefully slumber at night because of the annoying indicator light that’s part of many household electronics.
Countless devices and appliances — from surge protectors and televisions to headphones and laptops — often have a bright light that turns on when plugged in but can’t be turned off unless the product is unplugged. It’s a pesky bedroom nuisance.
“Exposure to
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