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Understanding 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 night progresses, with the final cycle lasting up to an hour. Most vivid dreaming occurs during REM, making it the ideal window for lucid dream induction. Deliver a cue too early, and you wake the sleeper. Deliver it during REM, and it can integrate into the dream as a signal. Traditional REM Detection Methods In