Won't go back to sleep?!?!

My son has the same routine every night. Bath at 7:30, eating around 8:00 and being laid down between 8:30 and 9:00. Usually he does well when we lay him down. May have to soothe him a couple times, but usually just goes to sleep. He sleeps for 4-5 hours and then wake to eat and will not go back to sleep!!!!!! He'll fall asleep while eating and if I try and lay him down he wakes up and is angry. I've tried feeding him again, changing him and cuddling until he falls back asleep. But he always screams when being laid back down. Why is it just in the middle of the night?!?! I need sleep!!!!!!!