Two main distinct forms of sleep:
- REM (rapid eye movement)
- NREM (non-rapid eye movement).
EEG's measure electrical activity in the brain and show the stages of sleep.
- Clear wave form = synchronised
- Unclear wave form = desynchronised
- Awake = fast desynchronised wave form.
- Synchronised wave forms are defined by frequency (Hz) and amplitude (size)
The stages of sleep on an EEG: (the first 4 stages are NREM)
- Awake: Beta wave; fast and desynchronised
- Relaxed: Alpha wave; slower, more regular, greater amplitude
- Stage 1: Light sleep shown by theta waves with small amplitude (4-7Hz). Also…