I'm the exact same way and wondered if it's the fresh air and nature that causes that. I can operate on 4-6 hours sleep camping or at the cottage for as long as a week and it's so refreshing. And it's the most refreshing sleep I experience.
I try so hard to replicate it in my normal life because I feel so accomplished when I wake up at 6am and walk down the road to shower and get ready for the day.
