Eiichiro Oda doesn’t sleep. The dude works hard. He seems to truly love creating One Piece since 80% of his day goes into writing and drawing it.
A couple years back Japanese TV show Baka Furi looked into this and reported that Oda probably makes around 3.1 billion yen which converts to $26...
I'm sure everyone here has heard of One Piece, a large manga/anime series that has no end in sight and its sole creator working himself to death.
A shame really.