Is my wife's frequent use of the bathroom at night caused by her Alzheimer's?

my wife is getting up many, many times during the night to go to the bathroom to urinate and have bowel movements. This is a fairly new issue. She wakes me up to tell me she has to go to bathroom. She is in early moderate stage of Alzheimer's. Is this normal? What could be causing this?Or is it just part of the disease?