Alright the man needs to slow down. As much as I appreciate the work he's putting into the series, overworking himself will only lead to negatives if he keeps going, both in the series and more importantly in real life, in regards to his mental health. Working like this causes a lot of stress build up. I heard that life as a mangaka was awful in Japan, but I'd bet even this isn't normal. Hopefully he takes a break after next chapter, if he's going this hard.
Full tweet btw.
"I couldn't sleep at all, but today I have 9 pencil cases. Since the start was early, I will do it with a short break."