On Christmas, she got up at 6am because I was picking her up at... 1pm. When I questioned that, she took a nap and felt better but seemed to be confused again later in the evening. Today, at 3AM she called to ask if I had slept in, because I was supposed to take her to the Dr at 1230. Totally confused and it took her a few minutes on the phone to get it right....thoughts? Stroke? Can dementia come on really quickly? Thanks.