Relationship psychologist Corinne Sweet has described the back-to-back position as one that can suggest couples are connected while remaining secure in themselves. The position is sometimes called “Liberty,” and it has been reported as a common sleeping style among couples.
Ultimately, there is no single sleeping position that can reveal exactly how a couple feels about each other. If your partner sleeps with their back toward you, it is not necessarily a warning sign. Comfort, habit, temperature, and personal preference may be the real reasons. What matters most is how you communicate and connect while awake.