I have recently bought Apple Watch 9. I have set everything that the other topics say. Like my versions are the latest for both of my Watch and iPhone. Everything about sleep tracking including the sleep schedule is active.
It recorded my time in bed. But there are no REM/Core/Deep data. How can I activate them?
See the 'View your sleep history' section in:
Track your sleep on Apple Watch and use Sleep on iPhone - Apple Support
"To receive sleep data from Apple Watch, sleep tracking must be enabled for at least 4 hours each night."
If you paired your Apple Watch after completing Sleep setup, you can still turn on Track Sleep with Apple Watch. In the Watch app on your iPhone, tap the My Watch tab, then tap Sleep. Then tap Track Sleep with Apple Watch to turn on this setting.
Recently bought Apple Watch doesn’t show REM sleep.
