Melatonin production normally peaks during the night.
Sunlight inhibits production.
Studies have shown that in permanent night shift workers the production of melatonin can be so affected that it disrupts the body clock and causes sleeping problems. In such cases studies have shown Melatonin taken in supplement form to be of benefit. Those working rotating shifts, however, do not suffer the same disruption in melatonin production and do not appear to benefit from this treatment. Melatonin should never be taken without first consulting your doctor.