D.C.
Hi there,
I don't have allergies but I know people that do and I can imagine how uncomfortable it must be. I would be very cautious about the benadryl and it making him sleepy even though it is always a blessing when an infant sleeps through the night. I don't know how old your boy is but I do know that breastfed babies need to wake up for food in the middle of the night usually more often than formula babies. I don't think it is a good thing if the benadryl is making him sleep too much. (but like I said I don't know how old he is). I am not a big advocate of giving babies anything to make them sleep better ie. Tylenol or rice cereal in their bottle. I would check with your pediatrician to see if there are alternative allergy medications that do not cause harm or drowsiness to your boy. Do they have a non-drowsy Benadryl?