DS just can't wind down to go to sleep and still goes from fine to overtired without any sleepy time in between. He has never done that head lolling eyes rolling thing but just screams when he gets tired. He needs to be rocked to sleep, and I don't mean just cuddled or gently rocked but bouncy rocky bop-around-the-living-room type rocking (and even then he often cries but less so than when put down). I don't mind for now because he is only 5 months but I am beginning to wonder if he'll ever be able to switch off to sleep or if I'll be rocking a hefty toddler to sleep every night!
I know of plenty of babies that need to be cuddled to sleep but none that require as much motion as my ds!