someone who imagines and recalls experiences with lifelike vividness and who spends considerable time fantasizing

• about 4 percent of pop.

biological clock; regular bodily rythms that occur on a 24 hour scale.

• jetlag disturbs this

REM sleep

• Rapid Eye Movement
• recurring sleep stage during which vivid dreams commonly occur.
• muscles are relaxed

• light sleep
• lasting 2 minutes
• hallucinations in this stage

• about 20 minutes long
• sleep spindles appear in this stage

• transitional stage between stages 2 and 4
• only few minutes long

• This stage has delta waves
• deep sleep in this stage

• suppression of immune system
• impaired creativity and concentration
• slight hand tremors
• irritability
• slowed performance
• occasional misperceptions on monotonous tasks

• 10-15 % of adults
• sleep disorder
• involves recurring problems falling or staying asleep

• 1 in 2000 people
• sleep disorder characterized by uncontrollable sleep attacks. The sufferer may lapse directly into REM sleep, often at inopportune times.

• sleep disorder characterized by temporary cessations of breathing during sleep and consequent momentary reawakenings.
• 1 in 25 people
• mostly overweight men

• sleep disorder
• high arousal and appearance of being terrified
• occur during stage 4 sleep

• occur during early morning REM sleep
• not night terrors

• underlying but censored meaning of a dream
• "safety valve"

• help process information from the day and fix it into memory
• serve a physiological function
• brain's efforts to string periodic hallucinations into a storyline

tendency for REM sleep to increase following REM sleep deprivation

suggestion made during a hypnosissession, to be carried out after the subject is no longer hypnotized; used by some clinicians to help control undesired symptoms and behaviors.

chemical substance that alters perceptions and mood.

Three Categories:

1. Depressants
2. Stimulants
3. Hallucinogens