During a disastrous groupon promotion at my last salon I had been doing full body hot stone massage from 9.30 till 3pm with out a break and very little to drink (very foolish, but what do you do) I passed out during a treatment with still three to go, luckily they could see how I was and went without. Another time some years ago I was the staff hairdresser for Marks and Spencer (loved that job) my little salon was next door to the Doctors and when it was my turn for my medical I popped in answered all her questions including the one have you ever fainted, which at that age 26 was a party trick of mine. I answered no as I didn't want any problems, went back into my salon to finish a client and promptly fainted. The Doctor was called in.:o