Versa 2 won't track sleep

[Tcircle]

My Versa 2 hasn't tracked my sleep for the past two nights. It's charged.  It's synced.  On Friday I went to bed around 1130 and woke around 730.  Saturday night (last night) I did stay up until 2 and was awake by 8.  The Versa 2 needs 3 hours of sleep to track it said.  My old one tracked naps too but whatever.  

Any ideas?

[Heather-S]

@Tcircle Is it reading your heart rate?  Have you tried restarting the device?

It will record naps under 3 hours, but you don't detailed sleep stages.  Detailed sleep stages need 3+ hours of sleep.  But mine records naps less than 3 hours all the time.

[Tcircle]

I haven't but I will.  I thought the first night was a fluke. 

It is reading my heart rate, yes.