The biological clock; regular bodily rhythms that occur on a 24-hour cycle.
Rapid eye moment 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.
Time in REM sleep where the brain is active but the muscles are inactive.
The large, slow brain waves associated with deep sleep.
Non-rapid eye movement sleep; encompasses all sleep stages except for REM sleep.
A sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times.
A sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings.
A sleep disorder characterized by a high arousal and an appearance of being terrified; unlike nightmares, night terrors occur during Stage 4 sleep, within two or three hours of falling asleep, and are seldom remembered.
According to Freud, the remembered story line of a dream (as distinct from its latent, or hidden, content).
According to Freud, the underlying meaning of a dream (as distinct from its manifest content).
The tendency for REM sleep to increase following REM sleep deprivation (created by repeated awakenings during REM sleep).
A social interaction in which one person suggests to another that certain perceptions, feelings thoughts or behaviors will spontaneously occur.
A split in consciousness, which allows some thoughts and behaviors to occur simultaneously with others.
A physiological need for a drug, marked by unpleasant withdrawal symptoms when the drug is discontinued.
A psychological need to use a drug, such as to relieve negative emotions.
Compulsive drug craving and use, despite adverse consequences.
Drugs (such as alcohol, barbiturates, and opiates) that reduce activity and slow body functions.
Opium and its derivatives, (such as morphine and heroin); depress neural activity, temporarily lessening pain and anxiety.
Drugs (such as caffeine, nicotine, and more powerful amphetamines, cocaine, and ecstasy) that excite neural activity and speed up the body functions.
Recurring problems in falling or staying asleep.
Psychedlic drugs, such as LSD, that distort perception and evoke sensory images in the absence of sensory input.
90 min. sleep cycle
Stages 1,2,3,4,3,2, REM.
divided consciousness theory
State in which one's consciousness is split into distinct components, possibly during hypnosis.
social influence theory
Hypnosis is a social phenomena where subjects act in ways appropriate for their roles.