If you have trouble sleeping, the Apple Watch might help you get to the bottom of what’s going on. New to watchOS 9, it can track what sleep stage you’re in. That means you can see if you’re not getting enough deep sleep or REM sleep, or if you’re waking up too often in the middle of the night. If you have insomnia or sleep apnea, this information could be very useful.
Read on to see how to use the advanced sleep stage tracking in watchOS 9.