What If we all slept at daytime?

Meno, an astronaut who discovered a new planet, landed on this planet. It’s 12 noon, and everyone is sleeping. Because it’s the world where people sleep at the daytime, not at night. And the life in this world is very different. People go to work at night and sleep at day. It is because they think, that working at night is good, and so the world accepted this.Meno couldn’t understand this all. He was just looking all around.

He described that when it was 7pm. It was quite dark. People went to do their work. People had to keep all the lights on while working. They felt that ghosts generally appear at the daytime, and not at night. They were must like people who live on earth. But the only difference was this.