My daughter regularly slept in a little tent, by herself, in the garden from the age of 8 onwards. The first time she did it I was convinced she would decide to come inside the house once it got dark but she never did, even when it rained.
A few years ago when we were having really hot weather, pretty much like now our bedroom was dreadfully uncomfortable and I couldn’t sleep. We’d got a hammock set up in the garden so in the middle of the night I decided to go outside and sleep on that. I’d got a very flimsy nightdress on and the hammock was right in the middle of the lawn but I knew I wouldn’t be seen as it was pitch black. Unfortunately, I hadn’t taken in to account next door’s security lights! So there was I in the middle of the night in my tiny nightie lit up for the whole street to see - classy!