I worked night shift as a nurse for about 1-1/2 yrs. It wreaked permanent havoc on my gastrointestinal system (& that was 20 yrs ago). Also, I was so sleep deprived that at times i was actually sleep-walking. I only learned that in retrospect, as i did & said some nutty things. Also, several times, i caught myself before making a medication error - which makes me wonder, were there any times when i didn't catch it, & made a mistake, unbeknowndst? I was also depressed the whole time. My whole world seemed gray; I could barely stay awake on the 1/2 hr. drive home; several times i pulled over, because my eyes would NOT stay open! Only people who are able to adjust, should work night shift, especially when there are important things at stake, like people's health!