In theory, reducing the blue light should help the problem with suppression of melatonin. There are apps for the Android operating system that work in a similar way. The Night Shift mode permits users to change the screen’s color to “more warm” (i.e., less blue light) or “less warm” (i.e., more blue light), without necessarily changing its brightness. In an effort to address this problem, Apple released the Night Shift application for its line of smartphones and tablets. Exposure to what some call “light at night” (or LAN) can acutely suppress melatonin, a hormone produced at night and in darkness, which tells the body it is nighttime. The main concern is over the short-wavelength “blue” light emitted by smartphones, tablets, and even televisions. The light emitted by portable electronic devices (PEDs), particularly when used at night, has drawn a great deal of interest recently.
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