I love the way you can skip small talk with serious questions!
My answer is Elon Must. First reason is I would get the whole 24 hours wide awake. Who can sleep while thinking about sending Humans to Mars?
Second reason is to have the understanding of what a big brain feels like. My wife says I am still a cave man defiantly not a rocket scientist.
Third reason I personally love solving problems. But Elon he is attacking all the really big ones at the same time. Fourth reason Maybe on the 25th hour I would be able to retain some of that power and skip a few generations of evolution for my kids.