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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 ...
Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity.
In the Greek tradition, Hypnos (Sleep) was the brother of Thanatos (Death), and the son of Nyx (Night). [7] According to Hesiod, Sleep, along with Death, live in the underworld, [8] while in the Homeric tradition, although "the land of dreams" was located on the road to the underworld, near the great world-encircling river Oceanus, nearby the city of Cimmerians, [9] Sleep himself lived on the ...
Hori et al. regard sleep onset hypnagogia as a state distinct from both wakefulness and sleep with unique electrophysiological, behavioral and subjective characteristics, [10] [12] while Germaine et al. have demonstrated a resemblance between the EEG power spectra of spontaneously occurring hypnagogic images, on the one hand, and those of both ...
Deficient sleep patterns are prominent in many psychiatric ailments. [18] Insomnia increases the risk of a depressive episode, sleep deprivation influences the onset of hypomania, and sleep disturbance contributes to the maintenance of mood disorders. [19] Amongst manic bipolar patients, sleep loss may act as a trigger in the onset of a manic ...
People do not swallow large numbers of spiders during sleep. A sleeping person makes noises that warn spiders of danger. [93] [94] Most people also wake up from sleep when they have a spider on their face. [95] A female Chinese mantis simultaneously copulating with and cannibalizing her mate; this does not occur every time mantises mate.
Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...
An antonym is one of a pair of words with opposite meanings. Each word in the pair is the antithesis of the other. A word may have more than one antonym. There are three categories of antonyms identified by the nature of the relationship between the opposed meanings.