The Dream

After humans invented the "Dream Machine", almost every person has kept sleeping in the Dream Machine for the past 3 decades. People lay inside the capsules of the Dream Machine and see dreams that people want to see. Dreams can be anything depending on the person. Some can fly in the sky, some can spend their life peacefully, and others can fight with aliens in a 2D world or of course, can be aliens too. The dream machine can show anything that people want, however, people cannot stop growing old.