There could be multiple reasons that your draining your battery.
A new app that pulls data In The background, Facebook syncing / twitter GPS and or wifi. That's just a few things to mention seeing that I can't look at your device I wouldn't know what apps you have and what ones pull data. But I would put my money on that being the problem.
Try this for one night if you don't mind and see if it makes the difference. Put your phone in airplane mode. And do ur same routine. Turn on your phone and see if it didn't drain battery.
Hope you fix it. I'm running skyraider Rom and my battery life is impressive
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