It’s been nearly twenty years since Fitbit first announced sleep tracking on the Fitbit Classic. I don’t remember that tracker, but I do remember the Jawbone Up, which launched two years later, in 2011, and was among the first wrist-worn wearables to popularise the very idea of sleep tracking – back when “sleep hygiene” still sounded like something to do with a flannel and a bar of soap.
A lot’s changed since. Jawbone no longer exists, Fitbit is now owned by Google, and sleep trackers are absolutely everywhere. Every gadget you own suddenly fancies itself a bit of a sleep doctor: the smart ring on your finger, the smartwatch on your wrist…
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