Sleep detection itself will be automatic, and will happen courtesy of the Watch’s accelerometer, which will detect if the user is sleeping based on the micro-movements caused by breathing. This way, the Watch will know exactly when and for how long you’ve been asleep. If you fail to hit your sleep goal for the night, it’ll will know you’ve been naughty and won’t let you open Tinder that day, so you can learn your lesson. Just kidding; Apple Watch can’t possibly be that cruel. To avoid distracting you at night, the Watch will auto-activate DND mode and will dim its display.

Waking up will be accompanied by a gentle tap on your wrist, or, if your partner doesn’t mind it, a nice, soft wake-up tone.

Have you been looking forward to sleep tracking on the Apple Watch? If you happen to be using a different kind of wearable, do you use sleep tracking? Share your experience in the comments!