another thing you can do to narrow your problem would be to turn wifi on while you sleep tonight, see if that will effect the battery drainage... when your connected to wifi your phone will stop searching the network.
I had the same problem as the OP. I have no idea why wifi is effected by the data being on and searching. FYI: I have the sleep policy to never. Here is what I posted in another forum:
Originally Posted by seandalton0 Wow, so just for giggles I installed that widget to see what I was getting at my desk, and it was running around 380-410mA, turned on the wifi (which also disables mobile data) and I'm down to 150-160mA immediately.
I'm going to enable logging and keep an eye on this now. Thanks for the info!
Ok. Here is where I have a problem. Everybody knows this right? Well, I thought I was having problems with my wifi. It drained my battery down to zero every night no matter what the battery was. With my Dinc I ran wifi (Y5 - so it was automatic as soon as I walked in the door) and the battery life at home was GREAT. Well, not so with my TB. I did notice however that I am on the fringe of 4G/3G as I am on the outskirts of Cincinnati. When I was on data it would bounce back and forth between 4G/3G. So, what I've tried is using the LTE on/off widget I turn it to 3G only when I get home and voila! my battery life is supurb with only about a 5% drop overnight max. This is while I'm on wifi. Why in the world should I have to regulate the data type while I'm on wifi?I'm going to enable logging and keep an eye on this now. Thanks for the info!