Now cheap fitbit watches have it, but our 1000$ garmin watches have not. Please garmin add this! 
www.theverge.com/.../fitbit-charge-4-smart-wake-dynamic-gps
Smart alarm clock was still a few years ago in Mi Band 1 or 2))
This the only feature I miss from my Microsoft Band all those years ago. Especially with on device calculation of sleep that we got now, hopefully this is close.
