Sleeping Troubles

Okay moms out there, I need some help! I've been using a boppy for Peyton to sleep in. He has now outgrown the boppy, and I need to find a new way for him to sleep. But every position I put him in he wakes up. He is also waking up every 45 minutes between 3 and 6 in the morning even though he has a full stomach. I've read everything I could get my hands on and haven't had any luck. If you have any suggestions that could help I would truly appreciate it! Please Help!!!