![]() Don't Miss: How to Turn Your iPhone's Auto-Brightness Off in iOS 12.And this can be done using Apple's "Night Shift." To prevent this blue light from blocking your ability to fall asleep faster, your iPhone's screen needs to move from the cooler end of the color spectrum to the warmer end. This makes it hard to fall asleep at night. Bright blue light, like that emanating from your iOS device, has a negative effect on your circadian rhythm in the evening, actually preventing the buildup of melatonin - the hormone that anticipates darkness - so that your brain doesn't know it's time to sleep yet. Our brains are very reactive to the light our eyes intake. If you're reading articles in bed or scrolling through Facebook before trying to fall asleep, you'll spend much less time on your iPhone before drifting off into slumber as long as you're using the right display mode.
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