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Sleep is a naturally occurring state characterized by reduced physical activity and sensory awareness.

Sleep is regulated by brain regions, specifically the hypothalamus and the pons, which control the sleep-wake cycle, also known as a biological or circadian rhythm.

The sleep cycle is influenced by light and darkness, relying on the production of melatonin , a hormone produced by the pineal gland, causing people to naturally sleep at night and wake up as hormone levels decrease with increasing light.

Sleep enhances cognitive functions such as memory and decision-making.

It also has a restorative function, which includes replenishing chemicals used during waking hours, repairing cellular damage, and enhancing brain plasticity.

Most body growth and repair happen during deep sleep when key enzymes are most active.

The adaptive function of sleep suggests that the behavior of sleeping developed over time to help conserve energy and reduce the risk of predator encounters at night.