Daylight also offers the most contrast between warm- and cool-toned colors. The higher the kelvin rating, the colder the color temperature. Bright or cool white light ranges from 7,000K to 10,000K.

If you've spent the day outdoors, the brightness of the phone makes no impact, Zeitzer says. It's what you're doing on that phone that matters. "At that point, it's not the blue light keeping you up.

Turning your bathroom into a chic oasis is easier than you think. Try this simple decor swap to instantly elevate your vanity ...