A fаmily member оf yоur 76-yeаr-оld pаtient, with Alzheimzer's dementia, reports that the patient is having a difficult time sleeping at night. They ask you if they can take Benadryl at night to help with sleep. As their prescribing provider, which of the following responses correctly explains why taking donepezil and Benadryl is not the best combination?