@MagicSummer
If you really think about it, it's a pretty strange idea for two people to share the same (small) sleeping space! How can you truly rest when you have someone else generating heat, snoring, huffing and puffing, etc.? I guess it's just about OK in the first throes of passion, but after that .....? No thanks.
I have always said this. I love DH, and we have a good marriage, but from about 10 years after we first started living together - so since our mid 30s, I have not been able to sleep in the same bed with him. His snoring started to become horrendous by the time he hit 33/34.
He was quite skinny when I met him, (when we were in our early 20s,) like 5 ft 10 and 10 stone. By the age of 30, he was 12 and a half stone. Still OK for his height etc, but heavier. Then by 33/34 he was 13 and a half stone, and his snoring became annoying. Within a couple of years it became unbearable.
We were in a 2 bed house too, so I didn't have a spare room to move into. (Our DD had the second bedroom.) We moved to a 3 bed in our mid 30s (20 years ago,) and I had my own room then. I never went back. As a few posters have said, it's ludicrous for 2 fully grown adults to share a 6 foot X 4 foot space to try and sleep in.
Some people seem to think 'earplugs' is the magic cure for a snoring partner,
or a super-king bed (or 2 singles) will magic all the problems away. Not always.
At the end of the day, separate bedrooms is the key to a successful marriage/relationship, and the key to good sleep! Obviously not everyone can do that if they don't have a spare bedroom, but as a few posters have suggested, they could get a fold-down bed, or sofa bed, and sleep in the lounge. Or do it so that the last one of you going to bed sleeps in the lounge.
Some men get really weird about it though (as a few posters have said,) and see it as a slight on their manhood/masculinity if their wife/partner doesn't want to sleep in the same bed as them.