I have heard of this. Do you use head phones? Or do u just catch the sound in your sleep?

USE THIS! It is called "lucid dreaming" it is an app that monitors your sleep pattern. Such as your rem cycle, sound, and movement! Not advertising lol, but sugestI this could also be thread about apps that work ;D? Also it is free.

But back to the topic, that app does work if you are able to catch the sounds