My Apple Watch says I'm getting 90 minutes of deep sleep — is that enough?

Two sleep doctors explain what deep sleep is, how much we need and the real number you should be looking for on your Apple Watch sleep tracker.

Forget about core sleep on your Apple Watch — this is the sleep metric you really need to pay attention to

What is core sleep is on your Apple Watch, and does it even matter? We look at which sleep stages matter most for quality rest and recovery.
ZDNet

Need a sleep study? It could be as easy as downloading an Apple Watch app soon

A team of researchers developed a new sleep study app. The app was developed using AI and an Apple Watch Series 6. BIDSleep aims to monitor sleep disorders without a sleep study. Researchers at the ...