What causes the imaginary sounds (bangs, crashes) or sensations (touch) that wake us from sleep?

Question

What causes the imaginary sounds (bangs, crashes) or sensations (touch) that wake us from sleep?

In: 198

Answer 1

I remember my dad saying it was the wood etc within the house creaking because it was cooling down because the heating was turned off. Could have been talking BS but I still believe it.