It is essentially a blue light, about - nm, which suppresses melatonin,  proportional to the light intensity and duration of exposure. Even recent history, humans have been in temperate climates for a few hours of (blue) in broad daylight in the winter. They gave their fire mostly yellow light. Incandescent light bulb is used widely in the twentieth century has produced relatively little blue light.  Kayumov and others. It showed that light containing only the lengths of Marz Sleep Sprays wavelengths greater than  nm does not suppress melatonin in bright light conditions.  wearing glasses that block blue light in the hours before bedtime may reduce the loss of melatonin. Use blue glasses block out the last hours before bedtime has also been advised for people who need to adapt to sleep earlier, and melatonin promotes sleepiness.

Pharmacy edit

When used several hours before going to sleep according to the curve of the melatonin phase response in humans, and small amounts (. mg ) of melatonin shift in the circadian clock earlier, thus promoting earlier sleep onset and morning awakening.  In humans, % cleared the mouth of external melatonin in one pass through the liver and secreted a small amount in the urine, were found in a small amount of saliva.