Did you know that in order to wean Savannah from a swaddle at 4 months we had to sew up the arms of a sleep sack and use that instead. Imagine a sleeping bag that zips up around your neck, that is how this child sleeps.
We decided that at 8 months she should be used to the fact she has arms and should be able to sleep with said arms. Last night we went cold turkey. Pulled out a sleep sack that didn't have the arm holes sewn shut and put her in that for bed. Big fail!
She fell asleep for an hour, then woke up hysterical. I found her in her bed doing what looked like a push up and screaming. I rocked her back to sleep (which is a big no-no in our house under usual circumstances). I left the room, only to hear a hysterical baby not 5 minutes later.
Our experiment was over. I put her back in the armless sleep sack, got her calmed down - which took almost 20 minutes. I think she could not understand why we would do such an awful thing and make her sleep with her arms out.
Moral of the story, if it ain't broke don't fix it.
My child will be the one at slumber parties in middle school in the sleep sack.