Do you mean sounds that are real or imagined? Reading this article made me look up this phenomenon I sometimes experience, and it turns out it's a documented thing: https://en.wikipedia.org/wiki/Exploding_head_syndrome
It can be really intense: an extremely loud sound, a bright flash of light and jerking of the neck muscles. It became stronger every time it happened - until it suddenly went away completely.
It always left me wondering how many stories about alien abduction etc were related to sleep paralysis. I read once that a feeling of being watched was common with sleep paralysis.
I've only experienced a couple of times, but that was the most noticeable thing about it. I knew about sleep paralysis before I first experienced, so it didn't really concern me (as soon as I realised I was awake but unable to move, I knew what it was and roughly what to expect), but glancing over to my doorway and seeing a vague silhouette just standing there watching me is somewhat disconcerting nonetheless.