What is the body clock? The body’s [biological clock] is a 24-hour cycle from day to night. It is affected by light and darkness, reminding the body when to sleep and when to get up. For the human body, the 24-hour rhythm biological clock plays many important functions, such as: Sleep and awakening, body temperature rhythm, body fluid balance and other physiological functions, such as hunger at meal time. Does the biological clock affect sleep? Of course, the biological clock affects our sleep through melatonin. Melatonin is an endocrine hormone in human body, which helps the body to fall asleep and maintain sleep state. Melatonin secretion has circadian rhythm and is more secreted at night. During the day, bright light Read More …