I am wanting an Apple Watch, but I understand sleep tracking isn't great on the device. I wear my Fitbit to bed each night to track sleep AND to vibrate me awake in the morning. These two things are important to me. Do any of you utilize your AW this way? If so, What sleep tracking app do you use? Are you happy with it? Also, do you use the AW to vibrate you awake in the morning? When do you typically charge your Apple Watch if you sleep with it? Do you charge it every day or every other day? Thanks!