An alternative that works great for me and my wife is having two double beds pushed together. We have the flexibility for both space and closeness to both sleep comfortably and when I come to bed later at night I don't disturb her.
Amen. I also love it. Maybe it's because of introversion, or having a hard time falling asleep most nights, but I just need my own room and bed. I enjoy cuddling but sometimes it feels like torture.
what about sex?
what about it? 'being in one bed != having sex', as well as opposite.