For 15+ years, I work at an Ethanol Plant on shifts that 'Flopped'.
For 2 weeks, we started at 8 a.m. and quit at 8 p.m.
For the next 2 weeks, we started at 8 p.m. and quit at 8 a.m.
The money was great, but a lot of people couldn't handle that flopping back and forth.
For a couple of years when I first moved to Nashville, I worked at a hospital where the shifts
consisted of: One day on day shift (7 a.m. to 3:30 p.m.), the next day was a swing shift (3:30 p.m. to 12 a.m.)
and next day, ( 11:00 p.m. to 7:30 a.m. ) Never really got used to that one!
The rest of my work life was pretty normal day shifts.
Sleep, for me, is still something that only happens in 4-6 hour stretches.
If I sleep for 8 or more hours, my wife is really worried something is wrong.