Well, that's understandable. Dh worked day shift for a few years, then night shift. I learned to rearrange my schedule accordingly. The first time I went through 6 months of chemo, I ended up throwing the whole normal schedule out the window. At first, I fought it. I tried sleeping 8 hours, and couldn't. I tried doing chores, and getting things done during my waking hours, as usual. I couldn't. One night when I woke up, I figured I could be doing something productive, like mopping, or cleaning out the fridge, or cleaning the bathroom, or washing/folding clothes. I'd get tired after that, then go back to bed, and sleep a few more hours. The first thing I'd do when I'd wake up during the day, was to care for my chickens. Some days I had enough energy to scrub everything down, turn dirt, spray for bugs, etc. Other days I could only give them feed, and water, then go home and rest.
What I've learned over time is that I do have somewhat of a routine, and I get everything accomplished in a timely manner, but my routine is not the same as everyone else's normal routine. At first, I felt somewhat guilty about my strange schedule, and hours. In time, I realized it didn't really matter, and there was nothing to feel guilty about. Dh is at work most nights, so he doesn't give a flip if can't sleep past 4 am, and do some house chores at that odd hour. He sleep during the day, so if I do coop chores, and come in at 10 am needing to nap until noon, it doesn't matter to him.
The point being, I understand how it is when we need to get our rest, and don't.