Sleeping with blanket?

Rebecca

My 7 month old sleeps so much better with a blanket, her room is more cooler than the rest of the house, and I've tried getting the temperature right, used a register booster, etc and nothing seems to work. I only let her sleep with it during naps, but I've been contemplating letting her sleep with it at night. It's a knitted blanket so it is breathable. She can sit up on her own, roll, and almost crawling so I know she could probably get out from under it if she needed, but my SO I'd worried it would get wrapped around her neck. Thoughts?