Further analyses revealed that the temporal variations in the EEG power spectra were distinct during periods of non-rapid eye movement (REM) and REM sleep. The previously observed differences in ...

and REM sleep, although this detailed data is only available to Premium users. The accuracy of sleep stage tracking on the Fitbit Charge 6 has been compared to EEG data in detailed analyses.

If I were looking at you in a sleep lab, I could actually look at your EEG recordings and I could look at how much stage three, four and REM sleep you get because that really is the determinant of ...

The study shows that the more time Santa's multi-tasking sleigh pullers spend ruminating, the less time they spend in non-rapid eye movement (non-REM) sleep. EEG recordings of brain activity ...