It is generally safe to sleep with an Apple Watch on. The watch is designed to be worn 24 hours a day, and it has several features that can help you track and improve your sleep.
For example, the Apple Watch can track your sleep patterns and provide insights into the quality of your sleep. It can also help you to create a bedtime routine and set sleep goals.
Additionally, the watch has a number of features that can make it more comfortable to wear while you sleep, such as the ability to enable Theater Mode, which silences notifications, or the ability to adjust the haptic feedback settings.
However, it is important to note that the Apple Watch is not a medical device, and it should not be used as a substitute for professional medical advice. If you have any concerns about sleeping with an Apple Watch on, it is best to consult with your doctor.