Symptoms of sundown syndrome include anxiety, confusion, restlessness, agitation and forgetfulness, according to WebMD. Individuals with sundown syndrome may also become delirious or have trouble sleeping.
An individual with sundown syndrome who has trouble sleeping may wander, pace, yell or become aggressive, explains WebMD. Symptoms of sundown syndrome, also called sundowning, are generally the worst during the middle stages of Alzheimer’s disease.
Nearly 20 percent of individuals with Alzheimer’s disease or other types of dementia develop sundown syndrome, notes WebMD. Its symptoms manifest as the sun goes down and can occur throughout the night. Research studies provide some clues about the cause of sundown syndrome, but truly understanding what makes it occur requires additional research.