The 'sleeping with one eye open' is a theme that frequently crops up. As one man said, being homeless means that fear is constant.
I don't have a backyard but I have a friend (a Mudcatter!) who does. That is a thought.
In the past I have camped out all over two mountain ranges in Oregon, by preference sleeping under the stars rather than a tent or camper, so that part wouldn't be as alien to me as it would to some.
gnu, catching a cold or a sore back would not be among my worries.