Ultradian Rhythms/ Nature of Sleep/ Sleep Stages
- Created by: rhallett
- Created on: 10-11-15 18:13
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- Ultradian Rhythms/ Nature of Sleep/ Sleep Stages
- There are 5 different stages of sleep which are defined by brain waves using an EEG
- As a person goes through non-REM, stages 1-4, their brain waves become larger in voltage and slower/more spread out
- Stage 1) Brain produces Theta waves (5-7 Hz), easy to wake up, person is only slightly asleep
- Stage 2) Still Theta waves, K Complexes occur, large and spiky waves possibly linked to sudden noises. Bursts of faster activity known as sleep spindles also occur
- Stage 3) Large, slow Delta wave (0.5-2 Hz) now occur and the person is deeply asleep, hard to wake
- Stage 4) Delta waves now dominate the EEG
- REM Sleep
- After 90 mins of NREM sleep, REM sleep begins:
- Stage 1) The EEG resembles the waking Stage 1 state and the brain appears active. Brain waves are fast, desynced and low in voltage
- Stage 2) The person's eyes move rapidly but all other muscles are paralysed
- Stage 3) Complex dreams occur
- After 90 mins of NREM sleep, REM sleep begins:
- Sleep stages are an ultradian rhythm because one cycle of REM/NREM takes 90 mins; less than 24 hrs.
- In a night's sleep the person will go through 4-6 Stages of NREM and REM sleep
- Deepest sleep (Stages 3 and 4) happens during the first part of the night, while periods of REM get longer towards morning
- In a night's sleep the person will go through 4-6 Stages of NREM and REM sleep
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