It would be nice if you could start and stop sleep tracking from your wearable. I have tried setting tracking to auto start when I go to sleep, but it still starts when I am awake at the computer. I thought it would be able to tell by heart rate, light levels, and motion of my wearable. Since I’m not on my phone all the time it would be easier to assign a wearable command to start sleep tracking but it appears you can only open the app, not start sleep tracking via the notify & fitness for mi band app