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During REM [Rapid Eye Movement] sleep, the brain monitors external sounds and incorporates them into our dream. In an episode of Friends "The One with Hypnosis Tape," voices heard while asleep affects Chandler's behaviors. In real life, the content of verbal stimuli during REM sleep is not always transferred into our dreams. However, emotions in sounds seem to affect dreams directly. Scary voices that you wouldn't blink an eye to while awake often haunt you in your dream. Your surreal, subconscious world is vulnerable to sounds inceived to your body. The movie Inception is not a mere science fiction when it comes to sounds.