I used the overnight method as well, I'd load 4 cans of product in the bag, get compfy and turn it on. I sleep in a big mans recliner (almost a single sized bed) and other than a nature call I'd sleep all night. Then at work I'd bring one of the 560cal Carnation units and one of the feeding syriges plus an extra bottle of water...and when the gang goes to lunch, I load mine up and enjoy it while I surf the net.