How to make your online game server run online with your computer shutted down?

See, I made my own online game. It runs through the engine of XtremeWorlds. I got my server side and the client side.

I just have a normal personal computer and I need to shut it down whenever I go to sleep. So, how can I still run the server side of my game with my computer is off? My players cannot connect to my game anymore.

Please help.. Thank you.

You will need two sticks about 20 inches long, two strings of the same length, one old radio and a pin.
Roll the strings around the sticks. Carefully take off 5 transistors from the radio. Connect them to the pin. Once it's done, you have to take a stick and stick it to the pin with transistors.
For the other stick, you can shove it up your ass.
Because no, it's not possible to run a server without a computer turned on at all times.