Thread: Becoming Lucid

While you're in a non lucid dream, can you hear whats happening in real life around you? Because I can remember dreams where it all of a sudden starts to thunder, and I wake up to a thunderstorm IRL. Also, I sometimes hear my alarm clock in my dreams and I look around trying to figure out where the noise is coming from, then I wake up.

If this is true, would it be possible to trigger lucidity by wearing headphones to bed, and during a period of REM sleep, have the headphones play a recording that would say "this is a dream" a few times over and over. I would hear this in my dream, right? and then I would realize that it is a dream and become lucid? This would be awesome!