These are the current best selling sleep trackers at Amazon.

SaleBestseller No. 9
Muse: The Brain Sensing Headband, Black
927 Reviews
SaleBestseller No. 10
Fitbit Alta HR, Black, Small (US Version)
4614 Reviews
SaleBestseller No. 13
Fitbit Flex 2, Black (US Version)
4306 Reviews

Details and pricing last updated at 2019-02-21 at 08:47 . Links and images via Amazon Product Advertising API