Welcome to DV!

Agreed with BrandonBoss. Never let your fear get the best of you!

In my opinion, it seems like you were experiencing some hypnagogic hallucinations when you felt like you were being tilted and lifted when you were closing your eyes. When you said you had unnerving reactions to every little sound, that could be part of the hallucination OR have something to you with your mind being aware while your body is starting to fall asleep. So that means you get to notice the transition from awake to asleep which you normally wouldn't notice, so it's kind of being hyperaware to your environment while in that state.

Hope this helps, good luck and have fun!