Another lesson is this one which I also learned the hard way: don't work long hours or late at night unless it is absolutely necessary. It doesn't sound like it

Another lesson is this one which I also learned the hard way: don't work long hours or late at night unless it is absolutely necessary. It doesn't sound like it was totally necessary for YP to be pushing this hard, and pushing that hard is what leads to these kinds of errors. Take your time and work when you're at your best.