I tend to agree with the findings of this study. I never liked working 12 hour shifts but I was already a bit of an old lady when I started nursing. Not old really but I was 39 and a new mom when I went to work on the night shift. It really tore me up. I am truely one who needs quality sleep to recharge. I actually like five 8 hour shifts over 3 twelve. I get to see my kid every day, cook dinner, help with homeowrk etc.... and I'm a lot less grumpy.....
Plus I have most weekends off now which is great, but my current job is mostly administrative these days which comes with it's own headaches.
Peace and Namaste
Hppy