Versa Lite is not tracking my sleep accurately

[Spikealight]

My Versa Lite sometimes loses part of the sleep time.  Mostly, this is at the beginning of the night where it will lose up to two hours before starting recording.  Las night however, I went to sleep approx 11:30 but at 3:20 needed the bathroom.  My sleep recording shows a start time of 3:22 having lost everything before.

Does anybody know a reason for this happening?

Moderator Edit: Clarified subject

[MarreFitbit]

Hello there @Spikealight, welcome to the Community Forums. Thanks for sharing the details about the issue with your Versa Lite. 

Your time asleep is calculated by subtracting your time spent awake and restless from your overall tracked sleep time. For example, if you slept 8 hours but woke up 2 times for 15 minutes each, your time asleep would be 7 hr 30 min. To learn more about your time asleep in sleep stages, see What should I know about Fitbit sleep stages?

Edit or delete sleep logs in the Fitbit app. For instructions, see How do I add, edit, or delete Fitbit data and activities?

Let me know how it goes. 

[Spikealight]

Yes, I understand how it should work, but why would it ignore the time from
11:30pm to 3:20am when I deffinitely was not awake? Also generally I go to
sleep around 11:30pm but often recording does not start until around 2:00am.

[MarreFitbit · Accepted solution]

@Spikealight Fitbit estimates your sleep stages using a combination of your movement and heart-rate patterns. When you haven’t moved for about an hour, your tracker or watch assumes that you’re asleep. Additional data—such as the length of time your movements are indicative of sleep behavior (such as rolling over, etc.)—help confirm that you’re asleep. While you’re sleeping, your device tracks the beat-to-beat changes in your heart rate, known as heart rate variability (HRV), which fluctuate as you transition between light sleep, deep sleep, and REM sleep stages. When you sync your device in the morning, we use your movement and heart rate patterns to estimate your sleep cycles from the previous night.

There are several steps you can take to increase your chances for getting a good night’s sleep. The National Sleep Foundation suggests sticking to a sleep schedule, avoiding naps in the afternoon, practicing a relaxing bedtime routine, and exercising daily among other recommendations.

Additionally, Fitbit offers several tools to help you sleep better. You can set a sleep schedule in the Fitbit app to help you maintain a more consistent pattern of sleep. You can also learn about your sleep habits through sleep insights and set a bedtime reminder in the Fitbit app to help you wind down for sleep each night. For more information, see How do I track my sleep with my Fitbit device?

Let me know if you have any further questions.