Anecdotally I think there must be.

I recently realized that I'm pretty sure I've had some form of tinnitus since I was a small child and never recognized it as such until recently. The sound inside of my ears is only there when I focus on it or if it's really quiet. The strange thing is because I always heard it when I was falling asleep as a child, it has always been associated with relaxation and rest, and so ends up lulling me to sleep rather than causing me distress like it does for so many other people.