Is too much Deep sleep scored down?

[skms]

Over the last four days, my 'Deep and REM' score out of 25 (one of the components of the total sleep score) has been behaving very strangely:  

Day 1: Score 21/25 from 47 mins Deep and 19% REM. 

Day 2: Score 19/25 from 1hr 38 mins Deep and 14% REM. 

Day 3: Score 18/25 from 1hr 19 mins Deep and 34% REM.

Day 4: Score 20/25 from 30 mins Deep and 27% REM. 

How can Day 3 be scoring lower than Days 1 and 4, with much more Deep sleep and REM also higher????

The only explanation can be that the system penalises too much Deep sleep, or maybe places some value on Light sleep?

Grateful if Fitbit can clarify?

Thanks, 

Strahan

[WavyDavey]

Hi @skms

I'm not sure any of us know the exact formula. That's part of Fitbit's "secret sauce".  Personally, I take as much deep sleep as I can get, but too much REM isn't the best. I do know light sleep is important, though it's not emphasized as much as the other two stages.

[AussieWalker]

I recently had the same experience:  1hour 2minutes Deep sleep and 30% REM.  Total score "18."  This score is much lower than I have gotten when I had similar Deep Sleep and REM scores ranging from 20% - 24%.  

I have to assume the score gets lowered with too much REM sleep.