This may be a bizarre question, but if the entire universe has a wave function, and wave function collapse for real (unlike in Bohmian mechanics or the Many Worlds interpretation), then what caused the collapse of the wave function of the universe? It must have been collapsed before we came about, the universe didn't just exist as a quantum superposition. Wouldn't this presuppose there is some external classical system, collapsing the quantum system? If so, what collapsed that classical system?! This seems to be a problem for me, and I am having a hard time understanding it. What collapsed the wave function of the universe?