Part of the joy of camping in the wilderness is becoming aware of the natural daylight cycles and timing one's activities to correspond. Finding a campsite in good time to set up and make some food before dusk, watching the sunset, the first few twinkling stars and then to sleep. I certainly feel more attuned to the natural rhythms of the day when camping, but I like going alone, and avoiding fire, and using artificial lights as little as possible too. Roger Ekirch talks of there being a pre-industrial (pre-artifical/electric light) type of polyphasic sleep divided into two stages, with a period of wakefulness separating them and that this state was the norm. http://en.wikipedia.org/wiki/Segmented_sleep Reports of people who've experimented with bi-divided sleep talk of 'never having been more awake in their lives' during the day.