My mum was put on Aricept a while back and I seemed to be constantly looking for improvement - even though I knew inside that a) she was only on a low dose and b) it was only a short time since she started on it. There were a certain amount of doom feelings whenever she then had a bad day. We all hope for an amazing change.......
In answer to your question though! Haven't heard that Aricept does this but it doesn't help everyone. Could the changes actually be a side effect? Mum's dose was reduced because she had an increase in falls.