Dream cycle is mostly mentioned as being 90 min. long, but is anywhere from 90 -110 min. It's not always the same length, I suspect, even for the same person. That's why we do WBTB towards the morning, after you had at least 4.5 hours of sleep. The longer, the better. Reason for this is, that longer you sleep, longer your REM becomes and they get much closer to each other. So if you wake up at the end of REM (most people do), you are very close to the next REM. |
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