There are several factors that can interrupt our sleep. Namely, a loud or restless partner can be a recipe for a bad night (or the impetus for sleep divorce, as it was in my case).
Sleep Hygiene For Couples Dr. Phyllis Koch-Sheras & Peter Sheras
Sleeping with a Partner - Sleep Savvy
Sharing a Bed With a Restless Sleeper: How Couples Can Sleep
Routines
Get better sleep by cuddling up with your partner
Sleeping with Dogs: Benefits for Your Health, Risks, and Precautions
How Separate Bedding Can Help Couples Sleep Better
At least we won't live long : r/ForeverAlone
What is 'Roll Together' on Mattresses and How to Avoid it - Bensons for Beds
Couples Sleeping Positions: 8 Ways to Sleep Better Together
What is 'Roll Together' on Mattresses and How to Avoid it - Bensons for Beds
Adults sleep better when they share a bed with a partner •
What annoys people most sleeping with their significant other
Does sleep quality improve if you sleep alone vs. sleeping in the same bed as your significant other? - Quora