Circadian? Is that like a clown circus act?

My wife works nights and is mostly alone all night, so I try to stay up late so she has someone to talk to. Unfortunately I also have a shifting schedule that changes every week, so I can't ever get into a sleeping pattern.

Without fail and regardless of what time I went to sleep, every day between 630-7am I wake up. And if I've had more than 4 hours of total sleep, there's 0 chance of me going back to sleep no matter how tired I feel.

My body is a MACHINE. It's BREAKING DOWN and things FALL OUT of it sometimes.