Being an insomniac I totally relate. I wake up countless times at night, turn over every few minutes, and when I finally sleep, it's never more that 3 hours in a row. And all that is in the comfort of my own home. Your detailed narration conveys no bitterness at all, though. I've read that when you cannot sleep, the best option is just get up and do something. Of course that's not possible when camping in the wild.

I really envy people that sleep as fast as their head touches a pillow. They don't know how fortunate they are.

Great narrative. You are a writer.