How can we tell the difference between dreams and reality and does it matter? There are consequences that become extreme if we assume that all that exists is just the body and ideas. This philosophical position is called solipsism, where there is no outside world, no things, and no people. ‘Dreams and simulations’ looks at states of consciousness and unconsciousness, brain stimulation, simulated reality, and being someone else's dream. Doubting reality of the world or ourselves leads to the conclusion that something or somebody is fundamentally real even if we are not.