Download Better Battery Stats in Play Store. Then you can see more clearly what is deaining your battery.
For me it was especially one thing that woke up my phone from deep sleep often. It was named Audio_Out 2 (1013). That happens because there is a shortcut in the audio settings so you can controll all audio apps from the notification screen, even if you're not using any audio apps. Somehow that triggered the Audio_Out 2 thing in my case. I turned that shortcut off.
Fast dormancy is also very eager to wake up the phone, even if your company don't support it. If that is the case, it's better to turn it off. There is an app for that to. I also recommend an app called Easy Battery Saver. Very good.
Also check google now, that is a big drain if it is on.
After I have done these things + setting up a reasonable mail sync I am now down to a little less than 1 % battery drain in deep sleep per hour.
EDIT: Sorry about this post. I just read page 1 and forgot to read the others.