21 times restless but still 93% efficiency - what does it mean?

[Joe7]

I just used my fitbit one for the first time, normal setting, and it tells me I have been restless 21 times tonight, still efficiency is quite hight at 93%.

Is this normal? It seems a lot of restlessness even though the efficiency is high.

[SteveH]

I'm not sure there is a "normal" - everyone is different. This article may help you understand the data:

https://help.fitbit.com/customer/portal/articles/1230068-about-sleep-tracking

[idahopacker]

Hi Joe7, I have found the sleep efficiency calculation to be fairly accurate.  I'm currently using two activity monitors and they are always within 5% of each other. 

[HH-SJ]

How to calculate efficiency from data provided by dashboard?

( Sleep duration, fall asleep, times of restless, times of awake and time(min) awake/restless. )

...

Dashboard shows "times of awake", how

How can I know Time(minutes) of "times of awake"?