So, for some reason, my Trenzalore is bright and not dark. It has a sun. How do I fix this?

wait a while till it becomes night i think

Trenzalore behaves the same way that the show said it does; long night cycle, veeeery short daylight cycle

TechyFarmboy is right. The fact that you're seeing the sun means that it's day. This is not wrong. It's always light when it's day.  Don't worry, the day only lasts a couple of minutes and night like 40 minutes.

Ohh, thanks, everyone. I was so confused.