User blog comment:Kaido King of the Beasts/Chapter 806: Jacked Off the Island/@comment-9022101-20151105205827/@comment-2226235-20151106163935

Oda was in the hospital for some kind of surgery (I don't remember what) about a year or so ago. He also mentioned in an interview that he only gets about 5 hours of sleep a night and never takes vacations.