Awake & alert: 10-13 beta waves per sec
Awake & drowsy: 8-10 alpha waves per sec
Stage 1: Sleep onset, falling asleep, NREM
6-8 theta waves per sec
mix of alpha and theta waves
lightest sleep
hypnogenic hallucination: brief intense sensation
Stage 2: light sleep NREM
Sleep spindles: high frequency brain activity
K Complexes: high frequency, reaction to external, processes it
4-7 theta & start of delta
Stage 3: between light & deep, NREM
1-3 theta & delta
Stage 4: deep NREM
lowest level of brain activity, neurons synchronize
REM : High brain activity, paralyzed
Beta waves