Hypnic jerks are an underestimated sleep motor phenomenon in patients with parkinsonism. a video-polysomnographic and neurophysiological study.

• Hypnic jerks are a frequent and constant video-polysomnographic finding in patients with parkinsonism.• Hypnic jerks in parkinsonism patients seem to appear early in the disease course.• Detailed neurophysiological analysis does not show any recurring, ordered propagation pattern of muscle activity during hypnic jerks.• Hypnic jerks share the same random motor activation and propagation pattern in both healthy subjects and in patients with parkinsonism.• The lack of any ordered propagation of the spreading of muscular contraction suggests a subcortical origin of the jerks, confirming our previous findings in a healthy patient.

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