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Excerpts of polygraphic recordings of excessive fragmentary hypnic myoclonus in NREM and REM sleep

Brief, asymmetrical, asynchronous potentials are visible in the explored muscles, sometimes without any associated visible movement.

Legend: EOG: electrooculogram, Mylo.: mylohyoideus muscle, Ext. Carpi: extensor carpi muscle, Tib. Ant.: tibialis anterior muscle, ECG: electrocardiogram, Abd. Resp.: abdominal respirogram, R.: right, L.: left.

(Used with permission from Elsevier. From: Baldelli L, Provini F. Fragmentary hypnic myoclonus and other isolated motor phenomena of sleep. Sleep Med Clin 2021;16(2):349-61.)

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