Sleep according to Webb (1992) is the “gentle tyrant”. The sleep wake cycle is a part of our body’s circadian rhythm. The term actually comes from two Latin words , circa (about) and diem (day). So a circadian rhythm is a cycle that takes ” about a day ” to complete. For human being in general, this means that they will experience several hours of sleep at least once during every 24-hour period . The sleep-wake cycle is ultimately controlled by the brain.It is during the deepest stage of sleep that growth hormones are released from the pituitary gland and reach their peak.

Why do we sleep? so basically there are two theories that can build a strong scientific explanation . A) Adaptive theory : It proposes that animals and humans evolved the sleep patterns to avoid predators by sleeping when predators are most active ( explains why…