I generally have a real tough time sleeping in the back yard any way, regardless of temps. I more than once have given up on a cold temp test do to inability to sleep. ( In the woods, I sleep like a log and have spent as much as 12 hours in the hammock, followed by an afternoon nap!) I have finally figured out that I might actually sometimes be dreaming that I am awake and can't sleep! I think I figured this one out when I woke up on a 10*F night on what I figured must be maybe 2AM. So I figured it must be pretty close to the forecast 13 or 14*( as it was 19*F when I got in the PeaPod), and I had established the limits of my sleep system, as I was not exactly warm but neutral on the bottom, an just barely cool on top around the shoulders. So I decided to just get up and go in in hopes of getting a few hours sleep. I figured I had been there about 4 hours, from 10PM until what I guessed was 1:30 or 2AM. But when I turned my headlight on to look at my watch, it was 5AM! So, I must have been asleep for at least a few hours straight, but dreaming I couldn't sleep as usual. So I just sealed the PeaPod up completely, warmed right up to actually warm, and stayed for another hour or so until the noise of folks going to work and dogs barking made it impossible to sleep, plus now I had to take a leak, so I got up about 0600 or so. Only to check my thermometer and find it was 10*F.