I used to be into this sort of tools, but in the end: - simply logging off from said websites accomplishes the same, even if you instinctively type fac <enter>

I used to be into this sort of tools, but in the end: - simply logging off from said websites accomplishes the same, even if you instinctively type fac <enter> (sometimes it's a barely conscious reflex), you'll just see a login screen - if you are REALLY so tired that the only thing you can get your brain to do is to aimlessly wander back and forth between these websites, it just means your day is over, no amount of restraint or stimulants will be as effective as just going to do something else to recharge your willpower (and brainpower)