I'm reminded of an anecdote I heard once from a psych(ologist/iatrist?) that goes something like: if you think you hear voices in your head, but the voices tell you to go to bed on time and drink plenty of water, you don't need a diagnosis/treatment.

The point is that a lot of things, when it comes to humans and their brains, is judged first based as to whether or not it negatively affects your life. Think of how we define addiction.