Hypnogram

A hypnogram is a form of polysomnography; it is a graph that represents the stages of sleep as a function of time. It was developed as an easy way to present the recordings of the brain wave activity from an electroencephalogram (EEG) during a period of sleep. It allows the different stages of sleep: rapid eye movement sleep (REM) and non-rapid ey...
Found on http://en.wikipedia.org/wiki/Hypnogram

Hypnogram

The final print out of all the night sleep stages (REM and non-REM).
Found on http://www.sleep-apnoea-trust.org/glossary-of-terms.php
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