Difference between revisions of "Sleep overview"
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Revision as of 13:59, 3 April 2017
- Sleep is entered through NREM sleep.
- Sleep cycles of 90 minutes, 4-6 cycles per night sleep.
- Non-REM 3 predominates in the first third of the night and is linked to the initiation of sleep.
- REM sleep predominates in the last third of the night
- Wakefulness in sleep usually accounts for less than 5% of the night.
- Non-REM 1 sleep approximately 2% to 5% of sleep.
- Non-REM 2 sleep approximately 45% to 55% of sleep.
- Non-REM 3 sleep approximately 15% to 20% of sleep.
- Non REM sleep, therefore, is usually 75% to 80% of sleep.
- REM sleep is usually 20% to 25% of sleep, occurring in four to six episodes.
| Sleep stadium | Sleep pattern |
|---|---|
| Non-REM 1 | Slow rolling eye movements (SREMs), decrease of alpha rhythm, POSTS (Positive occipital sharp transients of sleep), Vertex waves |
| Non-REM 2 | Sleep spindles, K-complex, <20% Delta waves |
| Non-REM 3 | >20% Delta waves |
| REM sleep | Low voltage background, rapid eye movements, muscle atonia |
