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| the bological clock; regular bodily rhythms(for example temperature and wakefulness) that occur on a 24 hour cycle |
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| rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur. Also known as paradoxical sleep, because the muscles are relaxed (except for minor twitches) but other body systems are active |
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| the relatively slow brain waves of a relaxed, awake state |
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| periodic, natural, reversible loss of consciousness--as distinct from unconsciousness resulting from a coma, general anesthesia or hibernation |
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| false sensory experiences, such as seeing something in the absence of an external visual stimulus |
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| the large, slow brain waves associated with deep sleep |
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| recurring problems in falling asleep or staying asleep |
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| a sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times |
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| a sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings |
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| a sleep disorder characterized by high arousal and an appearance of being terrified; unlike nightmares, night terrors occur during NREM-3 sleep, withing two or three hours of falling asleep, and are seldom remembered |
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| a sequence of images, emotions, and thoughts passing through a sleeping person's mind. Dreams are notable for their hallucinatory imagery, discontinuities and incongruities, and for the dreamer's delusional acceptance of the content and later difficulties remembering it |
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| according to Freud, the remembered story line of a dream |
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| according to Freud, the underlying meaning of a dream |
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| the tendency for REM sleep to increase following REM sleep deprivation |
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