I've been falling asleep at work for three years and no one knows.
Some body has had to have noticed that you are sleeping during work hours.
I'm a good actor. I have people convinced that I work hard every day.
It's reasonable to get tired if you didn't get a good nights sleep, but you shouldn't be falling asleep at your work on a regular basis. If you're falling asleep at work, then you're not going to be able to complete all of your work. This isn't fair to your other coworkers, and it can also lead to disciplinary action.
I'm a great liar and because of that, I can do whatever I want. I don't need to wake up early and follow rules anymore.
I think that sleeping on the job is not okay. Workplaces should be treated as professional environments, you should try to act that way too.