Humans may suffer from various sleep disorders, including dyssomnias, such as insomnia, hypersomnia, narcolepsy, and sleep apnea; parasomnias, such as sleepwalking and REM behavior disorder; bruxism; and circadian rhythm sleep disorders.
Especially during non-REM sleep, the brain uses significantly less energy during sleep than it does in waking.
Key physiological measurements indicators of sleep include EEG of brain waves, electrooculography (EOG) of eye movements, electromyography (EMG) of skeletal muscle activity.
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Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, inhibition of nearly all voluntary muscles, and reduced interactions with surroundings.
It is distinguished from wakefulness by a decreased ability to react to stimuli, but is more easily reversed than the state of being comatose.