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REM sleep, in which you dream, takes about 90 mins to reach after falling asleep. But when woken abruptly mid-dream, it’s possible to immediately start dreaming again if you fall back asleep. How does this work?

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REM sleep, in which you dream, takes about 90 mins to reach after falling asleep. But when woken abruptly mid-dream, it’s possible to immediately start dreaming again if you fall back asleep. How does this work?	1