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afternoon naps PURE deep sleep? Is this accurate?

fitbit is showing normal sleep cycling between light, deep and REM for me at night times, but I work shift patterns and quite often I just crash  in the afternoon the couch for 2 hours and wake up feeling like total garbage.  According to fitbit these naps are solid dark blue deep sleep.  is this accurate?  

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I expect that solid blue is not deep sleep.  It takes at least 3 hours of sleep for Fitbit to detect sleep stages and give a sleep score.

When you get a sleep pattern with above key: deep blue - asleep; light blue - restless; red - awake,

that deep blue  is not the same thing the sleep stage "deep"; it just means you were asleep with no sleep stage information available.  Actually, with less than 3 hours, it might just mean you were not moving around.

Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.

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Yep what @JohnnyRow said. This caught me out too - it's so confusing that they use similar colours for this more basic way of showing the data. Ha, I was really disappointed as I had thought it showed my sneaky naps were excellent quality and therefore totally justified! 

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