@arethereanyleftatall
If I ever could logistically wise, I would always always choose to sleep alone. It's so so much nicer. Sleeping in the same double bed every night is a funny old thing, the done thing, but no one likes it! Perfect world - have your affection, then sleep alone.
This is spades. ^
I have slept in a separate bedroom from DH now for 15 years, (since the mid noughties,) when we moved to a bigger house. It's utter BLISS!
Sharing a bedroom was OK for the first decade or so we were together, but then DH started to snore really bad. He was only in his early 30s, but he snored like an old buffalo. He wasn't overweight, he didn't smoke, and he rarely drank alcohol. He refused to see anyone about it, and said 'snoring is natural...' 
I used to go and sleep on the couch, and although it wasn't super comfortable, (quite narrow,) it was much better than sleeping next to him.
It wasn't just the snoring, it was the heavy breathing, prodding in the back with his elbow, kicking me, hogging the duvet, suddenly coughing (just as I was dozing off, and bloody waking me right back up again,) and grunting and fidgeting. The snoring was the straw that broke the camel's back. I HATED sleeping with him.
As much as I love my DH, I could never EVER sleep in the same bed with him again. If I ever entered a new relationship - if DH died or we divorced, I would not be sleeping in the same bed as him. (Not that I'd ever have another relationship...I doubt I would, not after nearly 40 years with DH.)
I don't think it's doable long-term to be honest, to sleep in the same BED as someone else. 2 fully grown adults, sharing a 6 foot x 4 foot bed is just ludicrous actually. Some people say 'get a super king, best thing we ever did!' Or 'if you want a good sleep, get a split-bed that has a soft side and a hard and get 2 duvets yada yada...' But whilst that gives you a bit more room, it doesn't do anything to help your suffering from your partner's snoring...
As the above poster said - it's the done thing - for a couple to sleep together, and some people think there must be an issue in the marriage if you sleep separately. In my experience, a marriage is more likely to survive if you have separate bedrooms. One partner being deprived of sleep (usually the woman!) causes deep resentment, and an underlying loathing of her husband/partner.
I had several snarky put downs shot at me from a couple of people at work, and my cousin, some 14-15 years ago for me and DH having separate bedrooms, sneering, and saying 'marriage problems???' and 'it's not normal,' and 'it's not right...'
Guess who is still together after 35 years of marriage? Yep! Me and DH. Guess who is NOT still married? Yep! The snarky fuckers who looked down on me and DH. Both work colleagues, and my cousin.
Also, as has been said, it's perfectly normal for many upper-middle, and upper-class people to have separate bedrooms, even from the start of their marriage. IMO, and IME, having separate bedrooms is more likely to make a marriage MORE successful, not less.