i don't know about your carseat but ours has an adjustable recline with a level on it. when it is level, it is reclined enough that her head doesn't flop forward. i assume we will run into this problem when she is forward facing though.
After I wrote this I realized this is what it must be! Thx!
Actually FYI per britax video we put a pool noodle under the seat against the crevice of seat and that made it level. She is happily sleeping on the way back from IL's as we speak!
Re: Sleepy head