eggboard writes: While blue light emitted by monitors and mobile displays has been widely cited as a cause in disrupting people's circadian rhythm, the evidence is thin: a narrow range of blue spectra might not be the problem (it may be a more complicated interaction), brightness may be more important, and Night Shift's (and f.lux's) effects are probably too negligible anyway. Apple's Night Shift feature lets you adjust the color temperature of your display to the warmer end of the spectrum. Apple notes, "Many studies have shown that exposure to bright blue light in the evening can affect your circadian rhythms and make it harder to fall asleep."
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