Visually induced lucid dream.

You imagine that when you fall asleep you are going to be in a room with notihng but a door. And on the walls the words "Do a Reality check" are written all over. You go to sleep, then wake up 4 or 5 hours later, and then just think about how you are going to dream this, and just relive the scene over and over again. And eventually you should find you actually are dreaming, and you do the RC and it works, you step out the door and prepare to have fun.