> One of the issues with wearing an Apple Watch during sleep is that many users choose to charge their Apple Watch at night. Apple thought about this and developed a feature that will remind users to charge their Watch beforehand so they can get through the night

Will that be enough though?

[Apple Watch sleep tracking revealed: sleep quality, battery, more](https://9to5mac.com/2019/09/02/apple-watch-sleep-tracking-revealed-sleep-quality-battery-management-more/)