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Slow-wave sleep
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Slow-wave sleep, often referred to as deep sleep, is the third stage of non-rapid eye movement sleep, where electroencephalography activity is characterised by slow delta waves.
Polysomnogram demonstrating SWS, stage four. High amplitude EEG is highlighted in red.
Polysomnogram demonstrating SWS, stage four. High amplitude EEG is highlighted in red.
Hypnogram
Videos
A hypnogram is a graph that represents the stages of sleep found during polysomnography as a function of time. It was developed as an easy way to present the recordings of the brain wave activity from
Slow-wave sleep
…Simplified hypnogram with slow-wave sleep level shown. Ostriches sleeping, with REM and slow-wave sleep phases Slow-wave sleep (SWS), often referred to as deep sleep, is…
Example hypnogram of a normal, healthy adult Here, both stage 3 and stage 4 are shown; these are often combined as stage 3.
Example hypnogram of a normal, healthy adult Here, both stage 3 and stage 4 are shown; these are often combined as stage 3.
A hypnogram (top) with other readings below
A hypnogram (top) with other readings below