Sign in to save your progress, vote, and build your own decks.Sign in
Sleep and Dreams
14 cards·by shenanigans
circadian rhythm
the biological clock; regular bodily rhythms (ex. temperature and wakefulness) that occur
on a 24-hour cycle
melatonin
sleep-inducing hormone
REM sleep
rapid eye movement sleep, a recurring sleep stage during which vivid dreams commonly occur
Why is REM sleep also known as paradoxical sleep?
The muscles are relaxed but other body systems are active
alpha waves
the relatively slow brain waves of a relaxed, awake state
sleep
periodic, natural, reversible loss of consciousness-as distinct from unconsciousness
resulting from a coma, gen. anesthesia, or hibernation
Stage 1 sleep
slow breathing and irregular brain waves; may experience hallucinations or hypnagogic
sensations
hallucinations
false sensory experiences, such as seeing something in the absence of an external visual
stimulus
delta waves
the large, slow brain waves associated with deep sleep
Stage 2 sleep
characterized by periodic appearance of sleep spindles
sleep spindles
bursts of rapid, rhythmic brain-wave activity
Stage 3 sleep
brain begins to emit delta waves
Stage 4 sleep
continuing delta waves, very deep sleep
insomnia
recurring problems in falling or staying asleep