This is the only bug I found:
"If you move your spouse directly into your own home, the Lover's Comfort effect may not activate correctly on sleeping. This can be fixed by asking them to move back to their original home, resting there to activate the effect, then moving back. Potential spouses who stayed at inns before marriage may not actually sleep in those places, but still if you pay spend a night at the inn, Lover's Comfort should activate."
Seeing as I did this with both my spouses maybe that's my issue as to why they will never sleep.
Sir, this did the "trick." We moved back to the Chapel of Dibella. Since it was only a short walk from our Markarth home, he actually followed her. Immediately upon entering, the objective for visiting your spouse's home cleared. I didnt even know the objective existed. Never noticed it in my journal. She did not sleep. She followed her normal ritual of praying to Dibella. 24 hrs later, I suggested we move back to Markarth. Upon arrival, I went to sleep, and received loving comfort. She was in the room, but not in the bed. Later that night, he noticed she was asleep in the bed around 1am. Joined her, and again received lovers comfort and 15% skill buff for 8hrs. She is "fixed." Thank you.
As far as the OP query, I understand many characters dont' like marriage, or just prefer to go it alone. I felt that way in FO3, because I could not keep dogmeat/Clover alive. But, my character likes the followers in Skyrim. He battles the elements with Lydia and Jordis at his side. He leaves Senna safely at home to supplement his earnings, and provide restoration, prayer and comfort. As a bonus, he can change residences from Markarth to Dibella frequently since they are so close together. It gives him a chance to just walk and spend time with her. He thinks she is extremely sixy when she prays.