So if the universe is a simulation then who created it? Are they a simulation too, created by another even more powerful entity?  Where does it end? Seems dangerously close to just believing that God created everything.,(reply>), @Christian Of course it applies to dreams. It applies to EVERYTHING and you can never to sure about anything.,(reply>), You created the simulation. And BTW your question also applies to dreams. If it is possible to dream how can you be sure your life is not exactly the same? Where is the start and the end?