These are the current best selling sleep trackers at Amazon.

SaleBestseller No. 7
Fitbit Flex 2, Black (US Version)
3379 Reviews
SaleBestseller No. 12
Misfit Shine - Activity and Sleep Monitor
5210 Reviews
SaleBestseller No. 14
Fitbit Flex 2, Lavender (US Version)
3382 Reviews

Details and pricing last updated at 2018-02-23 at 04:25 . Links and images via Amazon Product Advertising API