Maggie, by the sounds of it your son is only sleeping until his first sleep cycle and not geting through it. This is what my daughter used to do too, although she never slept that well over night. Come to think of it she still doesn't.

Is DS wrapped ?? I think basically the idea is to push him through that cycle, he needs to learn that after 30 minutes it is not time to wake up. He should be sleeping for longer stretches during the day. Like 2 to 3 hours at a time.

When he wakes do you go in and pick him straight up ? Maybe you could try just patting him on the bum, no eye contact and no talking other than the occasional shhhh. It will take time and lots of persistance but eventually it will happen.

Lots of luck to you hun.