When initiating sleep tracking from the phone, you have to confirm a dialog on the watch, asking you whether you want to launch Sleep. To initiate connection between the watch and phone, we need to start the Sleep app on watch - however, as designed by Garmin, it is not possible to programmatically start an app on the watch without asking the user for consent.
This is a companion discussion topic for the original entry at https://docs.sleep.urbandroid.org//faqs/garmin_start_dialog.html