Ever hear of shift work disorder? A commercial is running on one of my local radio stations for a drug to treat it.
Gets to the point that the cures are worse than the disorders they are chasing after. (Reminiscent of the folk song about the old lady who swallowed a fly, then all manner of critters from a spider to a horse in an attempt to deal with her problems.)
I worked in a large hospital for 20+ years.After having been there for a year or so I got a promotion that involved working nights (11PM-7AM).After a couple of months I found that I couldn't sleep to save my life and after six months I was *profoundly* depressed.I was then able to switch to the day shift and within a couple of weeks I felt much better in every way and after a couple of months I felt 100%...as if it never happened.Having a screwed up sleep schedule,particularly over a good period of time,can be really ugly.