"Ultimately you should remember that downtime is precious. It’s not healthy to be in front of a computer, let alone working, all day and night. You might not be doing other people harm but you may be doing harm to yourself."

This is spot on - screen fatigue is real - and spending 8 hours in front of a screen at work and then maybe 3-4 at home is not natural for the human mind or eyes in my opinion. I sleep much better if I shut everything off by 8 or 9 pm for an 11:30 bed time.