DH and I have slept in separate bedrooms for several years now, at least 10 I think, or possibly more, I honestly don't remember the exact year I moved upstairs. But we've been happily married for almost 42 years, and we both sleep better in separate rooms so for us it works fine.
He used to snore, constantly and LOUD. I'm a very light sleeper so was always moving out to the couch. He did have a sleep study done and does use a CPAP. We thought that would be the end of separate bedrooms but we tried sleeping together again and it just didn't work. We were both used to having the bed (queen size, the room isn't big enough for a king) to ourselves and we tried not to move during the night for fear of waking the other one up. Plus DH has restless leg syndrome and most nights it really bothers him. I've tried sleeping with him in a king size bed in hotels and he shakes the bed so much with his restless legs so that wakes me up too, so if we have a suite out to the couch I go. He has also hit me in the night by flopping his arm over on me. It's just so much nicer sleeping apart.
We each can go to bed whenever we want and not be afraid of the other one waking us up when they go to bed, DH can have his TV on as long as he likes, I can have my sound machine, etc. etc. I think a lot more married couples sleep in separate rooms than people realize. And some people may be too ashamed to even admit they sleep in separate rooms. We don't see anything wrong with it, and it's our marriage so we're the only ones whose opinions matter.