I'm interested in an Apple watch, actually I have a gear fit 2 and i use it for: - motivational for move from my desk when I'm working - track how much i walk during the day - track how much i sleep , it tracks the total hours of sleep and how if is deep or not I'm not going to use it connected to the phone and in sync with it, i have an iPhone 6 how long can it run on battery used without phone sync? as far as i know apple watch doesn't have a sleep tracker is it going to be in next iOS version? not sure if Apple released the beta like for iOS does it has a valid third party app integrated with apple health for sleep? any difference in battery life between apple watch 1 and 2? any alternative watch / band that works great with apple health?