Why are people light sleepers?

Question

I am a light sleeper myself. Generally why are people light sleepers? Meaning they wake up to almost any little noise.

Answer 1

I used to be a very heavy sleeper but I had a very big change in my life and went from sleeping through anything to I hardly sleep through any noice at all now. It depends some people it can be a life traumatic experience or it can just be the way people sleep. It was a traumatic experience for me, I miss sleeping so soundly and not waking up through any noices.