I'm planning to go on a little weekend trip in which I will be sleeping in my car in the middle of or near a forest. I've camped a fair amount but never in the offseason (it's winter here but that means overnight low of -2c and daytime high of 11c). And never in a car, although I froze a couple of times in a damp campervan (I didn't think it through and ventilate to let the moisture out). I have a hatchback that I can fold seats flat with and have a little mattress I can use.
1) any tips?
2) if I camp somewhere that has power for sites, I could put a little electric heater in the car, couldn't I? It has a kill switch in case it falls over and it wouldn't blow hotter than the a/c does so it's not going to melt anything...right?
PS I am too soft to sleep in a tent.