Supposedly, Hugh Everett who first proposed Many Worlds lived a gluttonous life and died early because of it. He figured it just didn’t matter since he would be conscious in a Universe that gave him a maximum lifespan.
Eat, drink and be merry for tomorrow we’ll still be alive in some other universe.
Hugh Everett also suffered from severe depression. It runs in the family - his daughter committed suicide. I read a book about growing up with him by Mark Everett, the lead singer (and basically everything else) for the rock band The Eels.