When in REM sleep, your inner ear spazzes out, similar to how your eyes move rapidly. If you happen to catch it, it sounds like vibrations, white noise, voices, or loud bangs. It can really sound like anything. It seems real, because you are actually hearing something. You are just hearing your own ears.
This is very common. "Vibrations" are discussed all the time when people talk about WILD, Astral Projection, or even other types of non-sleep related meditation.
It is a symptom of REM. Paralysis is also a symptom of REM. The two often overlap and happen together, but they can happen independently.
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