Sleep charts

[scubaesp]

How come on the sleep log the same two charts show 2x each? Times awoken & time asleep?

[Odyssey13]

sleep article

[Rothrock42]

I would like to know this as well. It doesn't make any sense.

Thank you for the link, I don't think it answers the question.

On my sleep log page I have "Time asleep over the past 30 days in hours" and "Total time asleep over the past 30 days in hours." Both of which show the exact same values.

I also have "Times awoken over the past 30 days" and "Total times awoken over the past 30 days." Which also show the exact same values.

[NewBee117]

It puzzled me at the begining as well. Here is how to make them look different:

If you take a nap, then the total time asleep will be more than the time asleep (1st chart). Same thing applies to the total time awoken, assuming you did not sleep through the nap (rare).

[scubaesp]

The link did not answer the question.

So are you saying that if I were to nap then they would be different but because I don't they are exactly the same?

They even have the same titles so it is very confusing.

[MatthewFitbit · Accepted solution]

If I'm understanding the question correctly - you're looking at http://www.fitbit.com/sleep and comparing the charts on the right.

There are four graphs - the top two of which display "Time asleep" and "Time awoken", while the bottom two display "Total time asleep" and "Total time awoken".

The top two are meant to display the information for the single largest sleep session of the day, which is going to be the night's sleep time for most users. The bottom two will display this same data, and will also include any additional sleep logs from that day (naps or short sleep sessions that supplemented your night's rest).

If you only log one sleep session each day, these graphs will always look the same. Hopefully that clears things up - let me know if I can answer anything else.

[cstdenis]

How do you calculate "sleep efficiency" percentage.  I thought it was the time asleep divided by the time in bed, but today I got this chart:

How can this possibly be 91% sleep efficiency?

[MatthewFitbit]

@cstdenis Per this help article, sleep efficiency is calculated as:

time asleep / (total time in bed - time to fall asleep)

So the time it took for you to fall asleep (that first hour or so) is not included in the equation. You were "asleep" for 91% of the duration between roughly 12:45am and 6:30am, and awake or restless for 9% of that time.

[cstdenis]

Thanks Matthew.  That explains it well.

[Cusco]

Suggest you/Fitbit staff place a brief explanation of the differences on the chart -- it took me an hour to find your good explanation of the differences in the sleep chart graphs