sundowning

The onset or exacerbation of delirium during the evening or night with improvement or disappearance during the day; most often seen in mid and later stages of dementing disorders, such as Alzheimer disease.

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sun·down·ing 'sən-.dau̇n-iŋ n a state of increased agitation, confusion, disorientation, and anxiety that typically occurs in the late afternoon or evening in some individuals affected with dementia

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sun·down·ing (sunґdoun-ing) confusion, agitation, and other severely disruptive behavior coupled with inability to remain asleep, occurring solely or markedly worsening at night; sometimes seen in older patients with dementia or other mental disorders.