I am an animal, the name of my species is human, my friends here call me happiedasiy.

In the animal evolution of time , species adapt.
Some for food, some for safety from fear of predators.
Others choose what is best for their survival, for body and spirit/soul.

Native Indians lived and worked during the day to producing food and upkeep of shelters.
But it is when the day ends and the moon rises it becomes time for spiritual ritual.
A time for spirit to connect under the stars, the beauty of the constellations under the moon, spirit becomes awake. In my opinion the hours of 10pm-5am is the best time for mindful and spiritual growth.

All animals that live in the ocean are driven by the moon cycles.
Prey and predators that walk the earth stay still during the day and are awake at night, due to human beings being their predators, and they KNOW humans rest at night.

I am a night owl. But I still need an appropriate time of sleep and food.

Circadian rhythm Circadian Rhythms Fact Sheet - National Institute of General Medical Sciences
So I would say that for some individual their rhythms and influences of light may differ from the light of the sun or the light from the moon and environment.
NOT a disease or disorder just different.
Comments Please, and I think we are one of 12!
Happiedasiy