I was introduced to the simulated universe concept by reading Tom Campbell's work - My Big Toe - his Big picture Theory of everything. It's an intriguing theory that makes sense and is growing in popularity by the day.
The TED talk below by Juergen Schmidhuber is in the same vein. Good talk if you enjoy consciousness theory and he starts with a great joke!
Troy Robins - Certified Clinical Hypnotherapist based in Oxford & Witney, Oxfordshire in the UK.