This will be my first fall/winter with a UDS (or smoking, period). I usually use mine for overnighters 'cause it lets me sleep. I'm not sure what to expect when starting the smoke in the evening at 50 degrees or so and having the temp droop into the 30's overnight. Does a UDS maintain the internal temp pretty well even with the drop in the air temp? Or do I need to open the vents a bit when I turn in, in order to increase the heat inside to offset the drop in air temp overnight?