Sleep Tracker

A built-in function tracking the length and quality of one's sleep is not only important for one's health, but NREM sleep also contributes to memorizing, implementing and learning movements, which is vital for any musician. It would be perfect to make one's practice more efficient.

Changed the title from "Sleep Tracker" to "Core: Sleep Tracker"

I would definitely like this as a thing so I don't know it would work as the Core is my only smartwatch so I look forward to upates on this or how it would be in an OS update?