No sleep cycle data for 1:45 nap. Does fitbit require 3 hours of sleep for this?

[Boboni]

My chart this morning indicates 1:45 minutes of "sleep" during a 1:55 total sleep period. Fitbit is not showing sleep cycle data for this time of 1:45, just a solid block of blue 'sleep' time. How many hours of non-restless sleep are required for fitbit to start generating sleep cycle data that includes REM, deep sleep and light sleep? Thanks!

[DanielJJ]

I'm not 100% sure but I have a feeling that it needs to be at least 3 hours for it to give you an analysis of your sleep.

[Boboni]

Thanks for the reply.  Does fitbit staff have a definitive answer for this? 

[DanielJJ]

I'm not sure, but I'll have a little look for you.

[DanielJJ]

You can click this link Fitbit-Contact us which will allow you to live chat so you can talk to someone or you can email them, depending on how quickly you want a response. I will still try and look for you though.

[DanielJJ · Accepted solution]

I found this:

Why don't I see sleep stages today?

There are a few scenarios where you might see your sleep pattern (which shows your time asleep, restless, and awake) instead of sleep stages:

• If you slept in a position that prevented your device from getting a consistent heart-rate reading or wore it too loosely. For best results, wear your device higher on your wrist (about 2-3 finger widths above your wrist bone). The band should feel secure but not too tight.
• If you used the Begin Sleep Now option in the Fitbit app (instead of simply wearing your device to bed). For more information on automatic sleep tracking, see How do I track sleep?
• If you slept for less than 3 hours.
• If your device’s battery is critically low

Here is the link: https://help.fitbit.com/articles/en_US/Help_article/2163

[Boboni]

Spectacular, I wasn't able to find that but I appreciate it! 

[DanielJJ]

You are very welcome, glad I could help.

[Boboni]

I'll try not selecting the "begin sleep now" option and will post back in a few days.  Last night, had two blocks of over 3 hours that weren't properly analyzed.