I found when my wife was in India for ~2 months I would stay up late watching YouTube videos / Netflix. In the evenings I found myself less sleepy in general. I also ate really bad food since cooking for one is miserable for me.

When I first started dating my now wife I slept better than I've ever slept before. All of my anxiety washed away and I felt incredibly content. Since then with buying a house, moving, job changes, owning cats, and a litany of other stressors, my sleep quality has substantially diminished. I don't attribute this to sharing a bed though. My wife rarely causes me to wake, neither of us really fidget in our sleep.