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According to amnesty international [0] you'd be put in solitary confinement and restrained with your hands handcuffed to a belt. From the report "Handcuffs are not removed at any time, even during mealtimes, or when the prisoner needs to sleep or use the toilet."

[0] https://www.amnesty.org/fr/wp-content/uploads/2021/06/asa220...

Breaking rules in US prisons leads to solitary confinement. I'm assuming there's something similar in Japanese prisons, although the conditions sound like they can't get much worse...

I can't logically think of any other lawfully worse punishment than what was described in the article. I don't know what they'd do for breaking rules in these situations, to be honest.

Well, the not sleeping thing is easy: they can simply scream at you, on end, for as long as they want. You're not going to get much sleep that way.