Apple Watch Ultra 2 intermittently tracks sleep

So I have the Apple Watch Ultra 2. I use it mainly to track my sleep, and up until a week ago it did it perfectly. All of a sudden it will now pick and choose when it tracks. Or just won’t track at all. I’ve checked all the settings, it’s up to date on software, not too tight or loose. I’m not sure why it’s not tracking. Mind you, the picture I was asleep from 8pm to 5:30 am

Posted on Sep 17, 2026 5:33 AM

1 reply

WheelieNick

Level 9 (74,110 points)

Sep 18, 2026 12:46 AM in response to DRickwartz

Toggle Sleep Focus Manually: Swipe up on your watch face to open the Control Center, tap the Focus icon (moon symbol), and turn on Sleep before bed.

Reset Your Sleep Schedule: Open the Health app on your iPhone, go to Sleep, and delete your current schedule. Set up a brand-new sleep schedule to clear out corrupted data.

Toggle Track Sleep Off and On: Open the Watch app on your iPhone, tap My Watch, select Sleep, and turn off Track Sleep with Apple Watch. Restart both your phone and watch, then turn the toggle back on.

Check Health Data Sources: Go to the Health app on your iPhone, tap Sleep, scroll down to Data Sources & Access, and make sure your Apple Watch is listed and allowed to write data.

Verify the 4-Hour Rule: Apple Watch requires at least four hours of continuous sleep detection during your scheduled window to log and display sleep stages. If you fall asleep far outside your set schedule without turning on Sleep Focus manually, it may fail to record.