My husband sleeps all night then sleeps a good part of the day. Is that from his dementia?

“ Up to half the people with dementia will have a sleep pattern that is not normal. They are often sleepy during the day and have difficulty with sleeping for long periods at night. They may have less deep, restful sleep. There are many possible causes for these sleep changes.” People with Levy Body Dementia also tend to sleep more. —from the Sleep Health Foundation.