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Slow-wave sleep (SWS), often referred to as deep sleep, is the third stage of non-rapid eye movement sleep (NREM), where electroencephalography activity is characterised by slow delta waves. [ 2 ] Slow-wave sleep usually lasts between 70 and 90 minutes, taking place during the first hours of the night. [ 3 ]
Turiya. In Hindu philosophy, turiya ( Sanskrit: तुरीय, meaning "the fourth"), also referred to as chaturiya or chaturtha, is the true self ( atman) beyond the three common states of consciousness (waking, dreaming, and dreamless deep sleep). It is postulated in several Upanishads and explicated in Gaudapada's Mandukya Karika .
A power nap, also known as a Stage 2 nap, is a short slumber of 20 minutes or less which terminates before the occurrence of deep slow-wave sleep, intended to quickly revitalize the napper. The expression "power nap" was coined by Cornell University social psychologist James Maas. [ 2] The 20-minute nap increases alertness and motor skills. [ 2]
Sleep. Sleeping Girl, Domenico Fetti, c. 1615. 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.
30 seconds of N3 – deep sleep. NREM Stage 3 (N3 – 15–25% of total sleep in adults): Formerly divided into stages 3 and 4, this stage is called slow-wave sleep (SWS) or deep sleep. SWS is initiated in the preoptic area and consists of delta activity, high amplitude waves at less than 3.5 Hz. The sleeper is less responsive to the ...
Eternal oblivion. Eternal oblivion (also referred to as non-existence or nothingness) [ 1][ 2] is the philosophical, religious, or scientific concept of one's consciousness forever ceasing upon death. Pamela Health and Jon Klimo write that this concept is mostly associated with religious skepticism, secular humanism, nihilism, agnosticism, and ...
Svapna. Svapna ( Sanskrit: स्वप्न, romanized : svapna) [ 1] is the Sanskrit word for a dream. In Hindu philosophy, svapna is a state of consciousness when a person is dreaming or is asleep. [ 2] In this state, he or she cannot perceive the external universe with the senses. This state may contain the conscious activities of memory ...
Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. Its opposite state is described as hypnopompia – the transitional state from sleep into wakefulness. Mental phenomena that may occur during this "threshold consciousness" phase include hypnagogic ...