I charged my 4s battery to 100% before I went to bed last night. Unplugged from charging at 12:30 a.m. By 8:00 this morning the battery had gone down to 76%. Checked the usage and it showed 6 hours 3 minutes, standby 9 hours 37 minutes. The only thing that is turned on is push email, and I had received 8 emails overnight. I had also closed all apps from the tray, even though I know that they shouldn't affect anything and are not active unless I am actually using them. I am not an iPhone newbie by any stretch of the imagination. Upgrading to 5.0.1 has decidedly NOT been a good thing for me. This is now effectively as bad or worse than my 3g and nowhere near as good as my iPhone 4.
No improvement here. I think it's actually worse. I used my phone less today than normal and it's draining as if I were actually using it. Not quite sure what the true purpose of the update was for but battery life isn't one.
I think the fact that most people seem to be getting better battery life and not worse shows that the fixes that were included in iOS5.01 didn't address whatever issue you're phone is experiencing. Could be a rogue program is running on your phone that didn't shut down properly. Could be an issue with the phone itself, ie bad battery, some bad part or whatever. Have you thought about doing a restarting the phone to see if that fixes the problem or doing a restore?
That's odd that it's showing 6 hours 3 minutes of usage when you were sleeping, that should all be standby time. Sounds like maybe something on your iPhone is 'stuck' running. Have you tried shutting down your phone and restarting?