Go to sleep at night at night light has what harm to the body
Can affect the physiological clock and body health, and obviously inhibit the secretion of melatonin.
If hard for melatonin secretion, turn off the lights, in the whole black environment, but not sleep well, this is less than melatonin secretion a little more impact.
Night light is weak, to sleep environment, did not affect the secretion of melatonin
