Pretty sure that isn't legal in most countries where HN'ers work from
Which is not to say that it is not done, but personally I have enough options that I would like to see them try to fire me over something like that. If I'm staring off into the distance to think about something or reading source code without pgdn'ing for five minutes, yes it's not uncommon that my screen turns off while reading something (until I get around to setting the timeout higher at least) but that doesn't mean I'm not working.
