Assertion: hypnic jerk | /r/HasProperty | generalized
Facets:
value: with an illusion
type: OTHER
Source sentences:
text: According to a study on sleep disturbances in the Journal of Neural Transmission, a hypnic jerk occurs during the non-rapid eye movement sleep cycle and is an "abrupt muscle action flexing movement, generalized or partial and asymmetric, which may cause arousal, with an illusion of falling".