I don't know when, and I doubt it makes much difference.
I asked Jonesn (He's a polysomnologist (sleep technologist)) about REM in naps. Maby you'll be interested.
Q:About naps, is it true that you skip all the sleep stages and go directly to REM? Or is this just a mistake made by associating REM with dreams, which can also happen douring non-REM sleep (right?).
A:If you're taking a real nap, as in you have already slept a normal period of time prior to that nap, then your body/mind does not require you to run through the traditional sleep architecture wherein you must have Stage 2 and Delta sleep prior to REM.
Think about when you sleep in on a Sunday or whenever and you get more than 8 hours of sleep. Past that time you can really only have Stage 1 (very light sleep) or REM, though these dreams usually don't last as long or as stable as those you would have during REM-5 (the last 90min of a regular sleep cycle).
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