8. Sleep
Types of Sleep
Characteristics Slow wave sleep REM sleep
EEG Displays slow waves Similar to EEG of alert
awake person
Motor activity Considerable muscle tone Abrupt inhibition of muscle
tone
Heart rate, respiratory rate Minor reductions Irregular
and blood pressure
Dreaming Rare (mental activity is Common
extension of waking time
thoughts)
Arousal Sleeper easily awakened Sleeper hard to arouse but
apt to wake up
spontaneously
Percentage of sleeping 80% 20%
time
Other important Has four stages Rapid eye movement
characteristics