As a teenager, when the sun began to rise, it was a signal that it was time for me to go home and get some sleep. 🙂 For myself, it felt right to stay up for 20 hours and sleep for 10. If I were single and free to live in seclusion, the 20/10 cycle would likely be my choice.
When I moved to a secluded rural region, I began going to sleep when the sun went down, and I woke around half an hour before the sun rose (the felt solar radiation woke me, and soon afterwards the roosters would begin to crow). The land had no city electricty nor telephone, so it was very peaceful and enabled me to sleep natural cycles.
Today, however, I am back in a city, and I find it difficult to go to bed before 3 to 5 a.m.. By around 2 a.m. I begin feeling more awake, which coincides with the sun having begun its ascent from the other side of the planet, plus it is when there is less electrical consumption in the city..
For myself, I had wonderful lucid dreams in the country, but now, the dreams are more like vague images of wandering thoughts.
For me, staying up late gives me time to think and to write on my hobby book of spiritual things (cheap hobby! 😉 ). And so for me, if not for the quiet early mornings, I would not have an opportunity to dwell within happy moments.