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

Sometimes in REM sleep I’ll hear my doorbell sound which startles/wakes me, but if the dog doesn’t bark, I know it’s all in my head (he goes batshit crazy when the doorbell rings).