S.L.
Why do you feel like you have to wake him up? He's obviously content if he falls asleep. If he wasn't he'd either keep nursing or wake up sooner. Just go with his cycle. And you will be able to keep up with him, just let your body adapt. My baby has only ever taken 5 minutes to nurse and only ever on one side at a time, completely differnt from my other two. But she's perfectly content and putting on weight and being like other babies. He probably screams because he's sleepy and wants to sleep and you wake him. Take a few days to see what his schedule is like. Feed him when he's hungry, put him down when he's sleepy, hold him when he's awake and just wants to be held, and see how he is. I'm sure he'll be fine.