How does sleep tracking work?

So, you love your shiny new fitness tracker and you want to start monitoring your slumber – but how does sleep tracking really work?

Sleep tracking has become big news in recent years. With roughly one in three of us using a wearables these days – whether it’s a fully-featured smartwatch like the Apple Watch 7 or the Samsung Galaxy Watch 4, or a more straightforward fitness tracker such as the Fitbit Inspire 2 or Huawei Band 5 – it means more of us are tracking our health in various different ways.

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