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Any assertion that is not based on science, even though in some circumstances attempts are made to appear scientific.
Machine that amplifies and records waves of electrical activity that sweep across the brain's surface; electrodes placed on the scalp measure these waves.
REM (rapid eye movement) sleep
Recurring sleep stage during which vivid dreams commonly occur; also known as "paradoxical sleep", because muscles are relaxed but other body systems are active.
Sleep disorder characterized by temporary cessations of breathing during sleep and consequent momentary reawakenings.
Sleep disorder characterized by uncontrollable sleep attacks; the sufferer may lapse directly into REM sleep, often at inopportune times.
Sleepwalking, which usually starts in the deeper stages of non-rapid eye movement (N-REM) sleep; the sleepwalker can walk and talk and is able to see but rarely has any memory of the event.
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