| A | B |
|---|
| consciousness | awareness of yourself and your environment |
| circadian rhythms | biological rhythms (for example, of temperature and wakefulness) that occur approximately every 24 hours. |
| William Dement | sleep researcher who coined the term rapid eye movement (REM). |
| Rapid eye movement (REM) | recurring sleep stage during which vivid dreams commonly occur; also known as paradoxical sleep, because muscles are relaxed but other body systems are active. |
| insomnia | recurring problems in falling asleep or staying asleep |
| sleep apnea | sleep disorder characterized by temporary cessations of breathing during sleep and consequent momentary reawakenings. |
| narcolepsy | sleep disorder characterized by uncontrollable sleep attacks; the sufferer may lapse directly into REM sleep, often at inopportune times. |
| night terrors | sleep related problem characterized by high arousal and an appearance of being terrified; unlike nightmares, seldom remembered (occurs within 2 or 3 hours of falling asleep during Stage 4 sleep.) |
| hypnosis | social interaction in which a hypnotist makes suggestions about perceptions, feelings, thoughts, or behaviors and the subject follows those suggestions. |
| posthypnotic suggestion | hypnotic suggestion that the subject will carry out after the hypnosis session has ended. |
