Unfortunately, electronic displays like those on phones and tablets have a higher concentration of blue light than the sun. Shorter wavelength blue light, by contrast, does the opposite: It suppresses melatonin and builds up histamine that helps wake us up. That helps keep us asleep and ensure we get a good night's rest. It usually starts a few hours before bedtime and increases greatly towards the middle of the night. As it gets darker we produce more melatonin. Unlike Superman or Supergirl, to whom it grants unbelievable power, in us the light suppresses melatonin. Read how to use Night Shift on iOS 9.3 Light and the brainÄuring the day we soak in light from the sun. As the name implies, it shifts the color spectrum of your iPhone or iPad display at night. With iOS 9.3 Apple is introducing a new feature called Night Shift.
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