When you dream, one part of your brain makes up the story while another part experiences those events and feels genuinely surprised by every twist. During REM sleep, areas involved in emotion and visual imagery become highly active, generating vivid scenes and intense feelings. At the same time, the regions that usually keep track of logic and reality quiet down, so your “observer” mind goes along with whatever the “storyteller” side throws at it. That split helps explain why dreams can feel both bizarre and completely believable until you wake up.
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