When you are tired, the best thing to do is
to get some rest. For those that must stay at their desks, play the COVER SOUND so others hear you work. The cover sound can also help cover up your snoring.
You should find a comfortable point at which you can lean forward with your elbow on the desk and your hand holding your forehead that balances your head from side to side motion. Once you
find the balance point, you can safely take your snooze. (beware of your drool-- make sure it cannot drip on your clothes or important documents.).
For those that can leave their desk, you should place a GLOP-1 on your desk to thwart those who would try to locate you. Once you leave the desk, find a quiet place where you can privately rest.