Most people are awake during the day and asleep at night because their circadian sleep-wake cycle is aligned with the outside world.
What is the circadian cycle?
The twenty-four-hour cycle that is part of the body's internal clock is called the circadian cycle or the circadian rhythm. The circadian cycle is of various types. One of the most commonly known ones is the sleep-wake cycle.
The systems of the body follow this circadian rhythm and the master clock for it is the brain itself. Any deviance from this cycle can cause trouble in sleeping patterns.
Insomnia is a common sleeping disorder in which the person suffering from it can experience serious trouble with sleeping. It's being said that these rhythms play an important role in the physical and mental well-being of an individual.
Therefore, the circadian rhythm ensures that the body processes are working effectively. The word circadian is derived from the Latin term circa diem which means 'around the day'.
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