Best answer: Sleep monitoring is offered on select Garmin fitness trackers and smartwatches, including the Vivosmart 3 and 4, Vivoactive 3 Series, Vivomove HR, and more.Budget-friendly: Vivosmart 3 ($67 at Amazon)Level up: Vivosmart 4 ($100 at Amazon)All-in-one: Vivoactive 3 ($187 at Amazon)Hybrid Smartwatch: Vivomove HR ($198 at Amazon)