A little skepticism about things one hears and sees is in order (it is not necessary to believe it). I hear my name pronounced loudly and clearly behind my ear a few times a year, and sometimes something else. It always makes me jump, and of course there is no one around.
We need to remember that the qualia of sound and color and so on are produced by the brain, not by the external world. The external world is usually the stimulus that leads the brain to this, but not always. "Sounds" and so on do not exist outside our brains -- they are just vibrations of air. It is the brain that makes it into "sound" and other qualia, and sometimes the brain makes mistakes.
It does not mean one is insane, although it can lead there if one takes it too seriously.
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