I recall it being nothing but deadly quiet with absolutely no sense of detachment. In fact, I was so tuned into my perceived surroundings that I kind of felt like my spidey-senses were in high gear in an effort to detect any potential danger. I felt as if I might be attacked and overwhelmed any second. Not a pleasant feeling, for sure.Dunno. But I've felt a sense kind of like you describe, I guess call it mega fight/flight/emergency/some shit's not right and I can't figure it out/reptile brain type of thing and for lack of a better phrase my ears go buzzy/fuzzy and I feel 'detached.' Like "I'm" not the one in control. Freaky stuff.
I remember a moment one night in Kenya where I was having an awful nightmare and got that feeling, woke up, opened my eyes, and the dream still played... now that was some shit... I had to shake myself out of that dream.