Sleep tracking: what am I doing wrong? Watch6 and 5 had same issue

[Specialist]

Hello, 

So i bought a pro 5 in January and originally for a few days it didn't track my sleep or tracked it in parts. Then stopped for a month, then suddenly started working properly the past 3 months. 

I was suggested to put it in sleep mode manually, which is what I now do every night and it works. 

Just bought the 6 classic, put it on, enabled sleep mode and went to sleep. 

I woke up and nothing recorded. 

How do I fix this. 

[Lordlinley]

I set my phone to sleep mode at night and my watch mirrors it works good u can also download sleep cycle then before bed activate it

[Specialist]

This is the 2nd device I got and first week or two it doesn't work properly then it seems to work.

[nattnatt]

I won't turn on 😩

[FoxyThePirate]

the firmware is bugged as my sleep tracking stopped after 2 days