sleep disorder hypnogogic jerk true true true http://purl.bioontology.org/ontology/SNOMEDCT/443438009 Sleep starts or hypnic or hypnogogic jerks are normal phenomena experienced by the majority of children and adults at sleep onset, to variable degrees. They are more common in children with motor and developmental disorders and are occasionally presented as potentially epileptic events if they are repetitive or if the child has epileptic seizures at other times. Repetitive sleep starts can cause recurrent wakening. They may be mistaken for myoclonic seizures or epileptic spasms. Hypnic jerk Sleep start jerks https://www.ncbi.nlm.nih.gov/books/NBK2609/