Problems Using Two Fitbits

[Whit.Bit]

I just got a Versa 2, and I also have an Alta HR. The Alta is older and a little beat up,  so I'd like to use it for sleeping and for work.  Then I'd like to use the Versa 2 for pretty much everything else. 

I've come across two problems so far.  One, when the Alta HR  was resting on my desk not in use, and I was using the Versa 2. The Alta tracked a sleeping period. This wasn't too bad,  as I was able to just delete it from my sleep log. 

But the second problem was more annoying.  I left the Vera 2 on my desk and then wore the Alta HR to bed.  Now I'm seeing that I got "basic sleep data" because Fitbit wasn't able to track a consistent HR.  This is exactly what happens when I sometimes accidentally remove my Fitbit while asleep. I think it irritates me sometimes,  so I take it off in my sleep.  Anyway, to me it seems to have been tracking the Versa 2 on the desk,  and not the HR I was actually wearing.  

Sleep data is one of my most important features,  so I was really hoping to get some help with this issue. 

Thanks.  

[Rich_Laue]

It normally will track the unit that sees the heart rate and sounds like there where times without an heart rate. Did you check the HR graph during the sleep period?