Half-waking during naps.

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Malcolm McCulloch

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Jul 31, 2013, 10:30:45 AM7/31/13
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Hey, I have a does-anyone-else question. I sometimes feel myself lightly awake towards the end of the nap and spend the last few minutes laying there aware of my physical location, position, and the sleeve over my eyes... but when I check the zeo it says I was asleep the whole time. Does anyone else experience anything like this? The only part I find weird is that according to the zeo I wasn't awake. It's a very restful experience, so I'm not complaining, just curious.

Malcolm

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Malcolm McCulloch
Philomath & creator

Andrew Stewart

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Jul 31, 2013, 6:01:09 PM7/31/13
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I have not had this, but this sounds like moderate evidence towards 'Zeo does not perfectly track REM states'. I think a new Zeo gives something like 85% agreement with sleep stage compared to a sleep researcher analysing a whole EEG and somonograph recording for a full night of sleep. That's pretty good.

Maybe it is the case that it is not quite as good at REM vs light vs awake for you taking short naps. I know it is trained on normal nights. Maybe it implicitly assigns a low prior to transitioning from light sleep to awake within that time period or whatever.

From my own experience, I was only very rarely able to actually fall asleep in naps. I did not lose consciousness and was only so refreshed. EEG confirmed this and the Zeo agreed. 

Also - I think the Zeo bin sizes might be 5 minutes or something. You could be awake for 2min of that final 5min and it still calls it 'asleep'. My advice - as long as you are resting, don't worry about it.

Andrew

Malcolm McCulloch

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Jul 31, 2013, 10:58:16 PM7/31/13
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Yeah, it has 5min bins but I'm looking in the history (leftmost button) where it has 1min bins...

I'm aware as well that sometimes people think they're awake when they're asleep... But I think this usually happens on the way INTO sleep.

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