The biological clock; regular bodily rhymes that occur on a 24-hour cycle.
Selective attention
The focusing of the conscious awareness on a particular stimulus.
REM sleep
RAPID EYE MOVEMENT
A recurring sleep stage during which vivid dreams commonly occur.
Paradoxical sleep (REM)
Muscles are relaxed but other body systems are active. The body is internally aroused, with waking-like brain activity, yet asleep and externally calm.
REM rebound
The tendency for REM sleep to increase following REM sleep deprivation.
Created by repeated awakening during REM sleep.
(since you are not getting enough sleep you go to REM faster)
Insomnia
Not an occasional inability to sleep when anxious or excited, but persistent problems in falling or staying asleep.
Narcolepsy
A sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep often at inopportune times.
Sleep Apnea
A sleep disorder characterized by temporary cessations of breathing during sleep and repeated momentary awakenings.