If you wish to use an Apple Watch to collect sleep data until your head explodes, there are apps such as AutoSleep that will fill that hole for you. Until you a

If you wish to use an Apple Watch to collect sleep data until your head explodes, there are apps such as AutoSleep that will fill that hole for you. Until you arrive at the conclusion that all those data aren’t making you sleep any better, then you’ll just use Apple’s built-in.