As long as you aren't a bus driver or railroad engineer, I don't see any problem. The world would probably be a better place if everyone took a little siesta on the job now and then. I had a day job where I'd feel like dozing off, but don't think I ever actually fell totally asleep, just half asleep with my lids nearly closed. Usually a phone would ring from headquarters and snap me out of it. You need to get phone calls. My own problem with unwelcome dozing is at home while I'm reading or studying. Either activity tends to knock me out cold.