My wife has dementia and takes both aricept and nimenda. She is now taking the 23mg of aricept. She had a slight teeheehee laughter when taking 5mg but now she has a very heavy laughter which is involuntary. One she goes to sleep the laughter stops. Once she awakens in bed the laughter starts again. Thanks for any help. We have tried all different kinds of meds and nothing helps to control it.