You go to bed tonight and a wizard comes to you in your dreams and tells you from this night on, you will be transported to 1 world from any piece of media you know, every single time you go to sleep.

That world will be just as real as this one, as in if you die there, you die IRL, you will still need to eat and use the bathroom. Time passes by a .5x speed in both places while you're sleeping so for every 8 hours you sleep you will spend 16 hours in the other world. When you go to bed in either world you are transported to the other one.