Very interesting topic, thank you.
Multiverse is a very fascinating and probable hypothesis, although in reality we will never be able to prove it. Or maybe yes... we are not fully exploiting our brain and sensorial power, but in the future who knows.
It can also be possible that we enter in one of our parallel universe very often , even if we don't realize it... what if dreams are the gateway to take a look to our parallele universe, where we have the consciousness of ourselves, but we live slightly or completely different experiences, in a world where, sometimes, also the physical laws -as we experience them when we are "awake"- are upside down?