Mathematical formula for Time Asleep score

[cprcrack]

Does anybody know what's the mathematical formula for the Time Asleep score out of 50? Does it take into account your sleep duration goal, your fall sleep time goal, your wake up time goal, all of them, none...? It seems like literally noone knows for sure, did anyone here achieve a perfect 49 or 50 Time Sleep score and tell us how they did it?

[LZeeW]

Hello @cprcrack and welcome to the Community.  Fitbit's sleep algorithms are proprietary.  No one knows the details.  My highest Time Asleep score is 47.  When I get a score like the, my asleep time total is much less that the Benchmark time asleep.  Fitbit says it uses your sleep goal, but I'm not so sure about that. Setting a sleep goal is optional.

[RiekoC]

Hello @cprcrack 

Similar to @LZeeW 's observations, my highest Time Asleep score was 46. Looking at my Sleep details for that time, my sleep start time was 9:31PM, 1 minute off my 9:30 pm target, and my wake time was 6:11 am, 4 minutes off my 6:15 am target. I exceed my sleep goal by 47 minutes, too.

So, I think the sleep goal might be considered as a factor, but I've long given up trying to figure out how the sleep score algorithm works.

[cprcrack]

Thanks a lot to both for the info. Maybe the awake time is also used and that's the reson very high Time Asleep scores are very difficult? @RiekoC when you achieved the 46, what was your Awake time?

[Rich_Laue]

This is my sleep after being awake for 40 hours

 

[RiekoC]

Hi @cprcrack 

My Awake time was 6:11 am, which was 4 minutes off my 6:15 am target wake time.