Why do my dementia symptoms seem worse later in the evening?

Sundowning in dement: Sundowning" in demented individuals, as distinct clinical phenomena characterized by the emergence or increment of neuropsychiatric symptoms such as agitation, confusion, anxiety, and aggressiveness in late afternoon, in the evening, or at night. It appear to mediated the lack of melatonin production destroyed by dementia. Often keeping a small light in the room reduces symptoms.