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What is it that causes the human body to sleep after a long day’s work?
Our bodies have an inbuilt clock which sends indications to the brain centre to secrete sleep-inducing hormones that cause us to rest. These signals are sent when light levels in the external environment cease, which is during the evening.
This mechanism of signalling the brain and the secretion of the hormone is called circadian rhythm. The hormone so secreted is called melatonin. Since pineal glands in the brain centre begin secreting this hormone during the evening, when you buy melatonin in the uk it is also called the ‘Vampire hormone’. And like vampires, this hormone disappears during the day.
However, natural melatonin secretion might get disrupted owing to some reasons, like, irregular schedules. Therefore, one can resort to the taking of melatonin supplements under proper medical supervision.