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  2. Sleep cycle - Wikipedia

    en.wikipedia.org/wiki/Sleep_cycle

    Sample hypnogram showing one sleep cycle (the first of the night) from NREM through REM. The sleep cycle is an oscillation between the slow-wave and REM (paradoxical) phases of sleep. It is sometimes called the ultradian sleep cycle, sleep–dream cycle, or REM-NREM cycle, to distinguish it from the circadian alternation between sleep and ...

  3. Sleep and emotions - Wikipedia

    en.wikipedia.org/wiki/Sleep_and_emotions

    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 ...

  4. Psychological stress and sleep - Wikipedia

    en.wikipedia.org/wiki/Psychological_stress_and_Sleep

    Sleep is a naturally recurring state of mind and body, characterized by altered consciousness, relatively inhibited sensory activity, reduced muscle activity, and inhibition of nearly all voluntary muscles during rapid eye movement (REM) sleep, [1] and reduced interactions with surroundings. [2]

  5. Sleep - Wikipedia

    en.wikipedia.org/wiki/Sleep

    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. [1] Sleep occurs in repeating periods, during which the body alternates between two distinct modes: REM and non-REM sleep.

  6. Polyphasic sleep - Wikipedia

    en.wikipedia.org/wiki/Polyphasic_sleep

    Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic , bifurcated , or bimodal ) sleep refers to two periods, while polyphasic usually means more than two. [ 1 ]

  7. Neuroscience of sleep - Wikipedia

    en.wikipedia.org/wiki/Neuroscience_of_sleep

    One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.

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    mail.aol.com

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  9. Sleep mode - Wikipedia

    en.wikipedia.org/wiki/Sleep_mode

    Sleep mode (or suspend to RAM) is a low power mode for electronic devices such as computers, televisions, and remote controlled devices. These modes save significantly on electrical consumption compared to leaving a device fully on and, upon resume, allow the user to avoid having to reissue instructions or to wait for a machine to boot .