disorder confusional arousal disorder sleep walking disorder http://purl.bioontology.org/ontology/MEDDRA/10041347 http://purl.bioontology.org/ontology/MESH/D013009 http://purl.bioontology.org/ontology/SNOMEDCT/80495009 http://purl.obolibrary.org/obo/HP_0025236 A parasomnia characterized by a partial arousal that occurs during stage IV of non-REM sleep. Affected individuals exhibit semipurposeful behaviors such as ambulation and are difficult to fully awaken. Children are primarily affected, with a peak age range of 4-6 years. F51.3 noctambulism sleep walking disorders sleep-walking disorder sleepwalking disorder somnambulism