Mine did fine overnight too. I just didn’t know when I started the thread. I filled it up before going to sleep and it was no more than half down when I got up. Worked great as far as capacity goes.

I pretty much lucked out.  I am new to pellet cookers, and I coming from a WSM.  With that, 12 hrs is nothing, and I didn't even think about it with the cook last night.  I filled the hopper at the start of the cook, and I was up until 2:00 a.m.  It would have been nothing for me to top it off before going to bed if could have stopped swaying long enough at that time.  In the future, I will make sure I top the hopper off before retiring for the night.