Sense not recording sleep accurately

[jdsfebmf]

My wife recently got me a Fitbit Sense to help me track my sleep cycles. I've tried everything, restarting the device, switching it from my dominant to non-dominant wrist, wearing it tighter, wearing it on the inside of my wrist, and changing the sensitivity setting. Nothing seems to help. I wear the device all night, every night, but some nights it claims I only slept for an hour when I know I've slept way longer than that. I typically go to bed around 11pm and sleep until 6:30am, and occasionally get up during the night to use the bathroom. But the Fitbit says I'm sleeping 1 to 3 hours most nights. What do I need to do to get this thing to work? My wife's Sense works fine and records her sleep accurately, so I'm not sure what's going on here.

[Guy_]

Hi @jdsfebmf  - by any chance do you have tattoos, as this can make it difficult for the watch to follow your heart rate accurately and therefore it can be unable to measure sleep stages and duration accurately.

[greggy123]

Why not swap watches for the night and see what happens.

If you really do not want to mess us one persons data, remove the watch from accounts and setup on opposite account. 

[Prettyinorange]

I have begun experiencing the same phenomenon. When I first got my Fitbit, it recorded my sleep with eerie accuracy. Now, after only a month of wearing it, like you, it’s missing hour after hour of sleep. The other thing that is strange is, sometimes not always, when I manually log the additional hours and save… then all of a sudden all the data loads onto the app, including the REM and deep sleep cycle information for the missing hours. Why didn’t that information show up until I entered the hours manually when the watch clearly detected that I was sleeping? I talked to Fitbit customer service and did everything they recommended. I reassured them I had no tattoos in the area. Then they had me reboot the watch which didn’t work. Then they had me increase the sleep sensitivity setting, which also didn’t work. They said the last resort, is to do a factory reset, which they could’ve talked me through over the phone, but then I would’ve lost all information in my Fitbit watch AND app; not just sleep information … ALL information. I told them absolutely not. I need to retain the heartbeat information that I have accumulated on my Fitbit as I have cardiac issues. That’s it. Those are the only options they gave me. I think that after only a month this aspect of my Fitbit watch has already broken and there’s nothing I can do about it. You can try what I have recommended, but it sounds like your watch is having the same problem as mine. Either this is a manufacturing defect in the watch/programming, or our watches have both broken somehow.