Why is my sleep data not recorded?

If the earbuds fall off when you are sleeping, or if the earbuds shut down due to low battery, sleep data will not be recorded. Replace your silicone sizing plugs with those suitable to the size of your ear canal to ensure that the earbuds don't fall out while you sleep. In addition, check the battery power of earbuds, and whenever possible, fully charge the earbuds before you go to sleep.