Sleep-Wake Cycle and Daytime Sleepiness in the Myotonic Dystrophies
Figure 2
Polysomnograms of a DM2 patient showing REM sleep without atonia with dream-enacting behavior history. Eye leads show rapid movements and EEG channels show desynchronized activity; both are features of REM sleep. (a) Excessive phasic electromyographic activity and intermittent increased tonic electromyographic activity in the chin with normal atonia in the limbs during REM sleep. (b) Sustained tonic electromyographic activity in the chin with normal atonia in the limbs during REM sleep. Right eye and left eye: electrooculogram. F4, F3, C3, C4, O1, and O2: electrode positions according to the 10/20 International System, referenced to combined ears (A1, A2). Chin EMG: electromyography of the mentalis muscle. Left and right leg EMG: electromyography of the left and right tibialis anterior. Note the time calibration mark.
