this happens to me all the time, I'll fall asleep at like 2am, wake up at 6, unable to fall back asleep and then I accidentally sleep away the entire day from like noon to 7pm. I've tried everything even just staying up for days to reset the cycle and nothing works.
This is not medical advice, but https://en.m.wikipedia.org/wiki/Promethazine Helped reset my Mum's sleep cycle.
Very low dose to start ~5mg, you must have uninterrupted 8 hours to sleep and take at least 1hour before bed. If you have too high a dose or too little sleep you will feel exhausted all day.
Easily solved:
Make a PLAN to sleep from noon to seven. Prepare something for a ready dinner, put on jammies, (pee first) get in bed, set the alarm. This is your gift to you. You won't be disoriented because you planned it. Get up, have dinner, enjoy your evening and go back to bed at your usual time.
My cat will not poop unless someone is watching him, and he had to poop at 5 this morning.
All these sound like my wives problems.
Well I wish her luck and the best.