We've had separate rooms for years. Initially for several reasons - his snoring keeps me awake, and my restless sleeping, up and down to the loo, disturbs him. Also, when we were both working, he got up for work at 3.00am and was in bed at 9.30pm. So he had to get dressed in the dark and I had to get undressed in the dark. Plus he used to catch up on sleep in the afternoons most days, so unless I thought of it beforehand, I couldn't go in the bedroom to change clothes, get something I wanted, etc. Really inconvenient.
Neither of us would ever want a return to sharing a room - even when we go away now we always rent a cottage/villa with minimum two bedrooms!