Just a random bit of useful knowledge here. When you plan on open air camping, and wanna keep warm, sleeping by a fire can be a smokey experience. I read this somewhere and tried it several times. Start a fire where you intend to sleep and it will warm the ground well. Longer it burns warmer the ground gets. Move the fire elsewhere when ready, and be sure to stomp out the embers. The ground stays warm a long time for a good sleep. Yall may already know this, but for those who dont, there ya go....