<unk>  <unk>  is a neurocognitive disorder which involves<unk><unk> s beyond those expected based on an individual's age and education but which are not significant enough to interfere with instrumental activities of daily living.<unk>  may occur as a transitional stage between normal aging and dementia, especially Alzheimer's disease. It includes both memory and non-memory<unk> s. The cause of the disorder remains unclear, as well as its prevention and treatment.<unk>  has been relisted as<unk>  neurocognitive disorder in DSM-5, and in ICD-11, the latter effective on the 1st of January 2022.
Mild cognitive impairment
Severe cognitive impairment
Dyssomnia
Extrapyramidal symptoms
Irregular sleep–wake rhythm
Orthosomnia
Parasomnia
Hypersomnia