Are you taking the benadryl strictly for allergies or also to help you sleep? it does have a strong drowsy effect. when i was active in my oxy addiction i would combine it with benadryl when i went to sleep and it would knock me OUT..i also would alternate with advil pm which has the same active sedative as benadryl. i avoid all this stuff like the plague now... I'd switch to a non-mood altering allergy medicine..