Watch 3 Sleep Tracker

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Currently using a watch 3 to see if I can get along with it or not, as a replacement for my Steel HR.
Looking for a decent sleep tracker, which weirdly doesn't seem to be a feature of the W3...
So far I'm missing the battery life of the SHR but we'll see how it goes....

 

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Yeah I was thinking Autosleep or Pillow, surprised it doesn't come with something like this built in to be fair..