[otachack]

Working 18 hours a day sounds massively productive but it is not sustainable. You are bound to hit a wall at some point, which sounds like your experience.

Take time off and learn to work at a more moderate pace with some breaks. Or keep doing the crazy productive days but take your time off more frequently, maybe even push for 4 day weeks.

[ki_]

oh yes, i absolutely agree. That was just an extreme example of recent years. It almost never happens. but it does happen. that was my point. the fact that i sometimes WANT to work that much.