PS101, Lec 13: 03/05/2013
Finished different stages of sleep.
• Parasomnias: Not normal sleep.
Sleep walking – Happens in Slow Wave Sleep or deep sleep 4% of adults.
Sleep terrors (night terrors) wake with a scream or a yell; difficult to calm, no memory of dream or
nightmare. Get worried if they wake up to someone who’s worried or nervous. (occurs in toddlers).
Teeth grinding (making noise when you’re exhaling), restless leg syndrome.
REM sleep behavior disorder (In REM sleep but not paralyzed, very rare but dangerous, because famous
for court cases for crime)
Sleep paralysis (RISP) (paralysis that’s supposed to be only in REM sleep but happens in other stages).
Catathrenia – groaning (opposite of snoring)
Sleeptalking – both REM and NREM.
Sleep paralysis (and RISP):
Sleep paralysis thought to be mix of REM atonia and other sleep stages or even wakefulness.
Called “recurring isolated sleep paralysis” when not associated with narcolepsy.
Some awareness of environment simultaneous with REM paralysis, difficulty breathing, and a pressing
feeling on the chest.
Related to alien abduction, ghostly encounters, “our of body experiences”
Caused by stress, changed environmental/lifestyle
Sleep paralysis across cultures:
Swedish mara or mare. Woman sits on people and sucks life in dreams. Where the term nightmare comes
Anglo hag or old hag. Fiji kana tevoro (dead relative comes back to feed on the sleeper and may yield an important message).
Nigeria/Africa – devil or witch riding your back.