"I believe I have unilateral T but my audiologist says I probably have bilateral (it's just that the T in my right ear is so low I don't perceive it). I've had times at night where my T 'traveled' to my right ear; my audio says it's because our auditory system is like stereo on steroids (); wherein the left can compensate for the right (and vis a vis). In doing so, sound (or more precisely, our perception of the sound) 'travels'. "