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Sleep is a state of reduced mental and physical activity in which consciousness is altered and certain sensory activity is inhibited. During sleep, there is a marked decrease in muscle activity and interactions with the surrounding environment. While sleep differs from wakefulness in terms of the ability to react to stimuli , it still involves active brain patterns, making it more reactive than a coma or disorders of consciousness.
Sleep occurs in repeating periods , during which the body alternates between two distinct modes: REM and non-REM sleep. Although REM stands for "rapid eye movement", this mode of sleep has many other aspects, including virtual paralysis of the body. During sleep, most of the body's systems are in an anabolic state, helping to restore the immune , nervous , skeletal , and muscular systems; [ 3 ] these are vital processes that maintain mood , memory , and cognitive function , and play a large role in the function of the endocrine and immune systems.
The diverse purposes and mechanisms of sleep are the subject of substantial ongoing research. Humans may suffer from various sleep disorders , including dyssomnias , such as insomnia , hypersomnia , narcolepsy , and sleep apnea ; parasomnias , such as sleepwalking and rapid eye movement sleep behavior disorder ; bruxism ; and circadian rhythm sleep disorders. The use of artificial light has substantially altered humanity's sleep patterns.
This disrupts the release of the hormone melatonin needed to regulate the sleep cycle. The most pronounced physiological changes in sleep occur in the brain. In areas with reduced activity, the brain restores its supply of adenosine triphosphate ATP , the molecule used for short-term storage and transport of energy.
Sleep increases the sensory threshold. In other words, sleeping persons perceive fewer stimuli, but can generally still respond to loud noises and other salient sensory events. During slow-wave sleep , humans secrete bursts of growth hormone. All sleep, even during the day, is associated with the secretion of prolactin. Key physiological methods for monitoring and measuring changes during sleep include electroencephalography EEG of brain waves , electrooculography EOG of eye movements, and electromyography EMG of skeletal muscle activity.