It is more common than one would care to imagine. The laws are ludicrous, if you are at home you have to have a minimum 12hrs rest between duties, if your preceding duty was more than 12hrs then you have to have at least the same amount of time off before starting again, yet when you are away from base in a hotel this rest can be reduced to 11hrs. So you are in an unusual environment, a bed that’s not your own, and usually noisy hotels. I was in Brussels two nights ago, and my room was separated from the one next door by a locked door. The chap in that room snored loudly from 9pm, right through the night until stupid o’clock. I then had to get up and go and fly 5 sectors and do a 12hr duty. Suffice to say today I cannot keep my eyes open.