hello user, i understand your concern - it seems from your description that now behavioral problems are concomitant with pre-existing dementia . such kind of sleep reversal and behavioral problems are commonly seen in dementia patients . but in such kind of picture , one have to rule out possiblity of delirium so getting him evaluated by a psychiatrist/neurologist would be a good idea . they may also perform some investigations like serum valproate levels (as he is on epilex) , eeg (you are mentioning some fits) and other routine blood tests . remitor and donep are unlikely to produce such symptoms , if delirium is ruled out , then such patients can be helped with adding low doses of antipsychotics like haloperidol and for sleep medicines like trazodone , but only after evaluation by an expert . take care