Fitbit Charge 2 also offers automatic sleep tracking, which records how long and how well you sleep in the Fitbit app, and lets you create a sleep schedule, complete with bedtime reminders and a silent vibrating alarm for gentle wake ups. (windowscentral.com)
Get vibration alerts for incoming calls and set vibrating alarms at custom times. (us.amazfit.com)
The smart fitness Band also keeps a track of your sleep cycle at night helping you learn how to sleep better while waking you up gently with the inbuilt vibrating alarm function. (pcquest.com)