As someone who was forced to do this for a couple months when I was in the Army, rotating shifts destroys your ability to get good sleep, its horrendous to actually experience. It took about 2 months before people started getting so sleep deprived that people started failing PT (physical training) tests and it took the brigade commander looking at our battalion and asking “wtf is going on over there?” and hearing what our battalion had done to our shift schedule and put a stop to it. He called over every single soldier who failed their PT test to hear our excuses, and when most of us were first time failures and we all had the exact same complaint, by the time he got to me, he was like “You’ve been on rotating shifts, unable to sleep, and were forced to take this test after a shift when you’re completely exhausted like everyone else?” “yes sir” “ok, don’t expect that shift rotation to last, I’ll be talking to your battalion commander after this. Send in the next person.” Dude was ready to just start ripping into us but changed his tune right quick after hearing about the fucked up shift schedule and lack of any common sense in the leadership’s ability to plan properly. One of the few times where shit actually rolled uphill.