What causes the imaginary sounds (bangs, crashes) or sensations (touch) that wake us from sleep?
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It’s only imaginary in the same way all sound is imaginary. A tree fell in the forest did it make a sound? The answer is it created vibrations in the air but it’s not considered sound unless it is heard. If you hear something, like tinnitus, it is a sound even though the air is not actually vibrating creating that sound.
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