Frequently!
For several years, the work I did was extremely demanding physically, so drifting off to sleep during the meetings was simply irresistable - and my wife was forever jabbing me in the ribs to wake me up. (Like about every five minutes!)
After several years of that I finally woke up to myself and decided to resume the apprenticeship that the borg made me abandon pre-1975. That, however, is another story for another time!