Sleeping like a baby?

Daniel has never been a great sleeper. As a baby, dad would put him to bed and I'd get homa about 1 a.m. to feed him. That 1 a.m. wake-up call continued until he was about 3. When he finally started sleeping through the night, he stopped taking naps. And I mean any nap at all. His day care and preschool teachers had a time with that! Every other child in the room asnooze on their mats, and my child tearing through the library area.
Well, he's stepped it up to another level. On a Saturday night two weeks ago, and again last Friday night, the child did not go to sleep. And I mean at all. Up all night, destroying his room in a flurry of activity, keeping me up with him. This past Friday night, I finally collapsed about 4:30, leaving him playing happily in his room and trusting that I'd hear him if he opened his bedroom door.
I though surely this must be a side effect of the ADHD medications we have him on. And thus I made an appointment with his doctor. But no, the doc says, if it were the meds we'd be going through this every night. More likely, he has allergies.
What?
It's like this, stuffy nose, lay down, can't breathe, so he gets back up. And the party's on.
So we tried some allergy medication before bed last night. And lo and behold, we all slept like babies.
--Misty