My Mom is living with my husband and I in our home. She has started taking her depends off in bed and going back to sleep. Any advice!

Mother is 97 and has dementia (mostly in the evening). When she does start to get up then, she wets all over the bed and floor. I don't think she knows why she does this, though I have tried to talk with her about it. She seems genuinely puzzled. Is this just another step in the dementia?