Sleep

Sleep stages

repeat every 90 min, longer you selep more REM

Awake

low voltage, high frequency brain waves

stage 1

low voltage, mixed frequency, hallucinations/floating sensation

stage 2

sleep spindles, k complexes, rapid brain activity

stage 3

mostly slow waves (transition to 4)

stage 4

Slow waves, deep sleep

REM

rapid eye movement sleep, genital arousal, motor cortex is active but muscles relaxed (dream stage)

paradoxical sleep

name for REM, internally aroused, externally calm

narcolepsy

chronic sleep disorder that causes sudden daytime drowsiness and sleep attacks (high emotion), rare

sleep apnea

breathing starts and stops throughout the night disrupting sleep cycle (more common)

night terrors

stage 4 sleep, scared, no memory, looks/sounds frightened, affects younger children