In people with dementia, such as Alzheimer disease, sleep patterns are often abnormal. As dementia progresses, the time spent in light sleep increases, so people are easily awakened.
People with dementia may also have disorders that contribute to sleep problems. Disorders such as arthritis, dehydration, and infections may cause pain or discomfort, interfering with sleep. Use of certain drugs or interactions between drugs may also interfere with sleep.

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