I have never noticed any regret at the absence of sound. I find it interesting that in my conscious dreams I am invariably naked, but unashamed. Telling myself nobody will notice seems to assuage fear. However, I am able at will to make myself unnoticed by those around me so that I am effectively just an observer . I cannot recall any gaps in time, or flashbacks.
Some people report that they dream in black and white .
Quite often in my conscious dreams I have a sudden 'memory' of a previously unremembered dream , representing itself as from 'long ago'. I know there are sleep researchers - and plenty of dream 'symbol' interpreters. Please let us know.