That is due to your exposure to sunlight, which helps set circadian rhythms. It's pretty well known that a bit of camping can help insomniacs or people with poo

That is due to your exposure to sunlight, which helps set circadian rhythms. It's pretty well known that a bit of camping can help insomniacs or people with poor sleep. Also, sunlight helps you wake up. I'm not a morning person, but when I went on an island holiday where the sun beamed into my room at around 5am, I never had any trouble waking up at that time. Also, I was spending all day outside, which supports my first point. Aside from that, physical activity, and lack of artificial light exposure helped you fall asleep early.