Playing devils advocate: as my mother descended into dementia my brother who lived close by would drop in for a hour or two every few days. He did not believe my father's concern about my mothers changing behaviour. However, my other brother and I who live a day away noticed her confusion when staying with my parents or when bringing my mother to our homes for a few days to a week. We came to the conclusion my mother was able to 'pull herself together' at least several hours at a time. But then tired and became more confused. Although, she developed skill in confabulating to cover her confusion. I wonder if others have noticed this when interacting with people developing or have full blown dementia.