On the topic of sleep, I found Matthew Walker's "Why We Sleep" to be a really good read. I've spent about a month actively working on my sleep hygiene and I've seen a noticeable improvement in my productivity.
How applicable is Why We Sleep to someone who lives with a partner who keeps slightly different hours? Not opposed, but they're generally still up when I've fallen asleep...
Why We Sleep isn't really a "10 tricks to sleep" book, it's a book explaining the state of sleep research in 2018.
I found the research survey (less sleep => more cancer, more Alzheimer's, worse emotional states; more sleep => dreams for self-therapy, better health outcomes, better memory; your night/day inclination is immutable like your eye color) more effective at motivating me to improve my sleep habits.
What about your differing sleep schedules causes problems? My wife is an early bird and I am a (relative) night owl.