I think when you work in there no matter when you leave , day or night the body is shattered. The ops people are a very good bunch in there its just too much of a work load with no support from above and no spare aircraft when things go wrong. It is a pitty because it was a great place to work. Anyway , i am getting away from the point. I use to find that if you swopped and did four nights that i was in bits on my days off. Found it hard to get back to normal hours on my days off.