Is sleep tracking one of those "because we can" things, or is it "because we should"?
(nobody told app developers that the watch can't track sleep, apparently; I've got such an app on mine right now)
Who knows. People love it. I love it. It is a great data point to compliment my training and other life distractions. Heck, the AW itself is a "because we can" product.
I know there are 3rd party apps out there. But, I am waiting for Apple to arrive with an integrated platform. I am sick of mediocre, disjointed 3rd party apps that junk up my devices. In my view, this is a core function (analogous to the the phone app, mail app, contact app, browser app, etc. on the iPhone) and it should be delivered with excellence and integrated into the overall activity tracking platform. I currently use Garmin, Apple, and Fitbit for a blend of activity tracking. Apple is the worst, by far, of the three. However, I also want to simplify my environment to just two platforms. Garmin is in forever, because that is my fitness device platform. If Apple can get the watch to a holistic activity tracking platform that includes sleep and HR tracking, I will definitely drop Fitbit. Until then, I will likely buy either a Garmin tracker or a FB tracker to wear along with my AW. I am holding out to see if Garmin updates the vivosmart HR, otherwise it will be the Charge 2.
Plus, the AW battery really does not conveniently support sleep tracking. It is do-able, but after using a long-lasting device for sleep tracking, the AW is not in play.