I know there have been many posts about battery performance since updating to iOS 5.0.1, some improved, some worse, and others no change, but my battery has been going completely dead when sitting unused overnight. Woke up this morning to find a dead battery again. My 4GS was working great with 5.0. Good battery life. No problems. Then I updated to 5.0.1. Went to bed with the battery at 98% and woke up to a completely dead battery. Recharged to 100% and the battery seamed OK all day. Just normal drainage with use. Charged back to 100% before going to bed, woke up to find the battery at 97%. Problem solved...Well, not really. Battery was at 83% when I went to bed last night, and again woke up to a completely dead battery. Now what? Should I do a Restore through iTunes? Should I wait for the next iOS update fix? Is it possible to go back to IOS 5.0?