Every time I leave the wifi on and wake up in the morning I have one "bar" of battery left. Even going to sleep fully charged. I thought I got a dud, so I exchanged it at the Apple store. But the new one has the same problem, even with almost no app loaded. Is Facetime the culprit? Do I have to turn off the wifi when I sleep? My sister's 2nd gen Touch upgraded to 4.x firmware doesn't have the problem so I think it could be the facetime causing it.