Just because you've never heard of it doesn't mean it doesn't happen. I've lived in two bedroom apartments with partners before and had my own bedroom and certainly know other couples who have done the same. There was a NY Times article awhile ago about a couple who had multiple dwellings on one piece of land and each had their own sleeping space as well as a shared space (the article was about how she decorated her space for the design section). A friend of mine has parents who are still together, have an active and exclusive sex life together and own their own homes next door to each other because they've found they are happier living alone. People live in all sorts of arrangements and what is going to be healthy for you and your relationship is going to depend on what you both want and need. What I can promise is unhealthy is doing something that one or both of you absolutely doesn't want to do, not because the other one truly wants to but because you are concerned based on what other people think is healthy or okay. Forcing him to give up a type of autonomy he is asking for, and has good reason to ask for, simply because you "read another post" is going to create a lot of tension. If you're okay with it and he is okay with it, stop worrying about what other people think. If you aren't okay with it and feel you need a partner who will always sleep with you or always need a bed partner then it is time to evaluate whether you and your partner are compatible because he has made it clear he needs his own space and nights alone.