I got some updates yesterday, and then 3 hours later my battery was almost dying, and my phone was hot for quite some time. It's all back to normal today though.
Why yes, I did have an unexplained drain yesterday. I was not even using the phone and had to plug it in twice. I restarted it later in the evening and plugged it in overnight. Working perfectly again today. Every once in a while I get an inexplicable drain and if I restart the phone it seems to fix it, at least for me it fixes it. And yes, I also had some updates yesterday.
Wrote a long thing about my strange battery drain today and then I realized that the charger had been plugged into the computer that was turned off last night, and not plugged into the wall socket. So I never did charge ot during the night after all. Sorry. I know this information doesn't help anyone else.