I’ve had similar experiences.

In my case it wasn’t like dreaming exactly, more like that in between state where you’re falling into a nap but still awake. Sound was kinda like being underwater, in fact recovering consciousness very much felt like surfacing into reality for lack of a better term.

It was kinda cozy, definitely not an experience to be scared of.

Coziness was something I did not experience as my conscious losses were always triggered by highly stressful situations (pain, fear). For me it was extremely overwhelming, as if my brain was on overdrive.