Shorter daylight hours can affect sleep, productivity and state of mind. Light therapy, also known as phototherapy, may help. It uses light boxes emitting full-spectrum light to simulate sunlight.

When I was a boy living in Edinburgh in Scotland, especially in December, when the hours of daylight were few, and it was cold, and often wet, I used to dream of escaping to a tropical magic kingdom.

For me, a theatre is a dark place. It should be mysterious; it's where we go to get away from all the utilitarian things we do in the daylight.

Some kinds of animals burrow in the ground; others do not. Some animals are nocturnal, as the owl and the bat; others use the hours of daylight. There are tame animals and wild animals. Man and the mule are always tame; the leopard and the wolf are invariably wild, and others, as the elephant, are easily tamed.

And when an architect has designed a house with large windows, which is a necessity today in order to pull the daylight into these very deep houses, then curtains come to play a big role in architecture.

And I say the sacred hoop of my people was one of the many hoops that made one circle, wide as daylight and as starlight, and in the center grew one mighty flowering tree to shelter all the children of one mother and one father.

I think the future of lunar bases has to be somewhere around the South or North Pole. You have less variation in temperature and more daylight hours.