Polysomnography showing saw-tooth waves of REM sleep

30-second epoch of PSG showing saw-tooth waves of REM sleep that are best seen over central regions typically accompanied by rapid eye movements, a low voltage mixed frequency EEG and chin EMG atonia.

PSG: polysomnography; REM: rapid eye movement; EEG: electroencephalography; chin EMG: submentalis electromyography.

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