The tanks on a 8801 are inside so depending on how cold outside and how warm you keep the inside shouldn't be a problem. The windows and vent may drip condensation on you but for a night you could handle it. Make sure you have full propane to keep the heater going.
It shouldn't be a problem keeping the heater going. If it isn't safe I certainly wouldn't go to sleep with on. Not sure about what yours burns but you should have plenty of propane for a day or two and I would guess more.
If you don't want the hassle of worrying about freeze issues, go with it winterized. You will need to keep some heat inside to keep items in the cabinets from freezing.