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Every night, your eyes move rapidly beneath your eyelids while you dream. This phenomenon, called Rapid Eye Movement (REM), is one of the most reliable indicators that a dream is in progress. For lucid dreamers, detecting REM in real-time opens the door to delivering gentle cues that can enter the dream and trigger awareness. REM Sleep and Dreaming Sleep cycles through several stages roughly every 90 minutes. REM periods start short (around 10 minutes) and grow longer as the