Track Your Sleep

Your Apple Watch can also track your health while you sleep. All you need to do is wear your Apple Watch to bed with the Sleep Focus on, and it will actively track the quality and quantity of your sleep. For instance, you’ll be able to see how long you actually slept and all the sleep stages you went through during the night, such as deep sleep and REM sleep.

Moreover, your Apple Watch will also track other things like your heart rate, Afib history, and respiratory rate while you sleep, and you can check all that in the Health app on your iPhone.