It really depends on your situation and on the work you’re doing. If you have a project that you honestly care about that you think is really good then you usually want to see it get done. So you might make the decision to overwork yourself even if you objectively shouldn’t. And bosses love to set that up, so they’ll give you a bunch of annoying crap that you don’t think is valuable. But they make you do it and then you end up having to work later in the evening to get done the stuff that you actually care about. Of course, that’s something that we all need to be very careful about, but in the short run it’s hard to stop.

And another situation that’s even worse is that you might lose your job. Sometimes telling the boss no means that you will be unemployed and if you need to make that money to pay the bills then you might be f*****.