Quinn Norton:

Technically Americans work slightly more hours per year than the Japanese, but neither of those numbers include unpaid overtime or extra work you’re supposed to do around and for your regular job. Uncounted, this work remains unreal, though its consequences are harder to dismiss. The Japanese have defined a form of death-from-productivity: karōshi. Karōshi is when you are so productive your heart or head break and you bleed to death inside yourself. Conversely, if those organs have persisted but the mind has not, karōshi can become karojisatsu: suicide from overwork.