NEVER DROOL ON YOUR KEYBOARD, ONLY ON YOUR LAP
I'm the master of the work-place stealth nap. I just swing my chair around so it faces away from the door, slump down a bit so my head is below the chair back, and let 'er rip. If I can get up to close the door first I'll do so, but everyone knows that if you get up for any reason at that key "sliding into sleep point," you can lose your chance. And then you'll just be slumping with your eyes closed, without getting any sleep. No good -- not worth the lost time, not worth the risk of detection.
Incidentally, the turn-the-chair-around technique isn't only to avoid detection -- which isn't that big a deal when you think about it. No, no, no. It also helps to hide those embarrassing things we do when we nap: spasmatic kicking, head bobbing, drooling, snoring, farting, muttering, what have you. I mastered my method years ago when I had an officemate, so you can bet my skills are unparalleled. No bullshit: it took him months to realize what I was up to every time I spun that chair around.
The brief feeling of confusion & foggy-headedness in the momnets after you wake is unpleasant, but within about 3-5 minutes, I'm re-charged, and ready to rock the rest of the afternoon away.
And that ends this public service announcement.