I'm a Mother of a 22 year and a 25 year old. My 22 year old was similar to your 9-1/2 month old. When he started to grow out of his swaddler, I got a bigger blanket. Some children find it more comforting to be craddled tighter than others. My oldest never needed that but my youngest needed it for a very long time. Even when he was a small child he liked to have the covers tucked in tight. When I asked my doctor about it I was told that it had something to do with being tucked in tight inside my womb. Since he was a large baby when he was born, it made sense. My oldest son was much smaller, so that's why it made sense to me. I don't know if this will help you, but it did help my son. I just bought a bigger blanket, one that wasn't real heavy, sort of thin, and used that instead. He slept, but still not through the night. As for being tired, I truly do feel for you. I was there myself and there were many nights I just wanted to sleep and couldn't. Try a larger blanket, but try to get one that is thin. I hope it works and I hope you get some sleep. One last thing, I never put my son on his back, he always slept on his side. But since I'm an older Mom and back sleeping wasn't the thing to do back then, I never had to worry about his arms coming out of his blanket. As he got older he slept on his stomach with his face turned to one side or the other.