Sleep tracking

[Tatarmater]

My sleep tracking time is being weird. I once went to bed at 9:33 PM and woke up at 4;55 AM, and it said that I got 7 hours 7 minutes of sleep. Anyone else finding that problem?

[shipo]

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@Tatarmater wrote:
My sleep tracking time is being weird. I once went to bed at 9:33 PM and woke up at 4;55 AM, and it said that I got 7 hours 7 minutes of sleep. Anyone else finding that problem?

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So, elapse time by my math is 7 hours and 22 minutes; did I get that correct?  If so then subtract a few minutes drifting off to sleep, a few more minutes for rolling around and/or getting up in the middle of the night for a quick trip to the bathroom, and there is your 7:07.

[major310]

It's not always going to be 100% accurate. It's not going to start counting immediately once you close your eyes. It still gets the job done good enough.

[jl9233]

I have a similar issue. My data shows I went fell asleep last night at 10:37 PM and woke up at 5:10 AM yet it only shows me as having 5hrs 41 mins of sleep. Digging into the details it shows 0 minutes to fall asleep, 24 times restless, 3 times awake and 52 mins awake / restless.

Night before last the data shows me falling asleep at 12:29 AM and waking up at 5:58 AM yet it indicates that I got 5 hrs 6 mins of sleep. The data for this night shows 0 minutes to fall asleep, 10 times restless, 1 time awake and 23 mins awake/restless.

Rounding to the hour for mathematic simplicity, last night I should have gotten somewhere north of 6 hours of sleep. Night before last, using the same logic I should have gotten a higher number of sleep hours.

In the Fitbit Sleep Tracker FQA it states that they use this equation to calculate your sleep efficiency: 100 * time asleep / (time asleep + time restless + time awoken during sleep)

This issue I have is that time asleep is calculated in hours/minutes. Times Restless and Time Awake appear to be calculated in number of event anomalies. For example, in the second night I have a total of 11 restless+awake events. However, the last data point is 23 mins awake / restless. Is the calculation: 100* time asleep / (mins awake / restless)? Also how do you see the “time asleep”? The final number shown in the dashboard in the time asleep after the calculation.

[Mordred_13]

I too used to face the problem. What happens is that, when your HR is still approximately near your Resting HR, the device thinks you're still sleeping. Best way is to do a few jumping jacks (to quickly elevate your HR) to confirm that you have woken up.