Leave it to those Asians to 1-up everything in existance, and the Snuggie is no exception.

There's an interview with the inventor on the sales page, where he saysthere were three problems with other sleeping bags which led him to invent his own:
1.You can't get the things you need without leaving your sleeping bag.
2.You can't stand up and run away when attacked by a bear.
3.You can't turn around in your sleep, can't bend the wall of the sleeping bag, and they were constrictive.