If you use an Apple Watch to track your sleep, there's one stage of sleep that you might be confused by: core sleep. So what is it exactly and how much do you need?
The Apple Watch 10 offers up in-depth data surrounding how long you’ve slept, how often you wake up, and how your time is divided across different sleep stages.
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Our team of experts are constantly testing the latest sleep tech and we've rounded up the best sleep trackers on the market for all budgets.
