It unusual but pretty telling that Rita and Harry sleep in separate beds, even when they stay in hotels. That's something you rarely see with married couples (as well as unmarried ones) in movies made after the '50s. I assume this is Rita's choice.
That's definitely not true! Couples sleep in separate beds (even separate bedrooms) for a number of reasons. One might be a restless sleeper who disturbs the sleep of the other person. One might work on a different shift than the other. Or, one person might need completely different conditions (ex.: needing soft vs. hard mattress).
Separate is an acceptable choice and is not "unnatural" at all! In this film, it can be a way to show her problem(s). But, it serves a far different purpose for many people.
(W)hat are we without our dreams? Making sure our fantasies Do not overpower our realities. ~ RC