that getting enough sleep is the single most important thing a person can do, other than not smoking, which is the biggest killer of all. I also do my best to eat decent, healthy food, just not too much.
Most of my working life I did some kind of shift work. I spent ten years at DCA, Washington National Airport, and I was often scheduled "turn-around", meaning I was scheduled to get off at 10pm one day, had to be back at 6am the next. If flights ran late for some reason, I got off later, still had to be back at 6. I was in my early 20s, and could do it, but I was real aware of how exhausted I often was the next day.
I honestly think that among the reasons I'm in such amazingly good health is that I have mostly gotten enough sleep, I've never smoked, I tend to sit or stand straight, not slouch like so many do, I drink plenty of water, and eat reasonably well. Yeah, I should consume more fruit and veggies, but I never do fast food, and try to minimize consumption of highly processed foods. Little things really do add up.