Sleep follows circadian rhythms however within sleep there is another type of rhythm called an ultradian rhythm- (A rhythm less than a day)
5 sleep stages; first 4 NREM and 5th is REM sleep
One sleep cycle lasts 90mins
Awake stage produces beta waves. Amplitude of waves increase as you go through sleep.
Stages 1 and 2; alpha and theta waves. Relaxation. Low heart rate. Temperature drops
Stages 3 and 4 Delta Waves, low metabolic rate. Growth hormone produced
REM sleep 'paradoxical sleep'. Brain and eyes active, body paralysed. Hard to awaken someone
Goes 1, 2, 3, 4, 3, 2, REM, 2, 3, 4, 3, 2, REM
A02
Assumption that REM sleep is dreaming Demet and kleitman demonstrated this link by waking participants up in REM sleep. They reported dreaming.
They also found that dreams were recorded outside of REM sleep
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