My job is mental not physical but it still puts a stress on your body. I always thought when I did labor work that the brain guys got it easy.......I was dead wrong! I noticed also as I get older I don't require as much sleep. A good 5-6 hours is enough. Maybe when we start getting older our body's automatically think we are going to miss out on something before we pass on and we don't need as much sleep? Lol