Yep once, and with permission too. I was a police officer and had worked two 8 hour shifts back to back (4 PM to 8 AM) I had 8 hours I was supposed to be off until my next shift at 4 PM, but during that 8 hours off I had to testify in court. So, I only got about 3 hours sleep before role call for another 16 hour shift (we were short handed due to vacations and officers out injured). My sergeant told me to go into the office after midnight and take a nap with my head on a desk and he told dispatch to wake me up in 2 hours or if I had a call to answer. Well 2 AM comes and the dispatcher comes in and wakes me up. My neck was killing me and I had drooled onto the desk pad. When I sat up the drool made the desk pad stick to my face. The dispatcher lost it.