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Re:Good sleep, good learning, good life (2012) by dirtyaura on Friday October 19, 2018 @07:31PM (#18260837)
Although as a team member I'm biased, Oura ring is great and tracks your sleep stages and body signals during the night (HR, HRV, Temperature): https://ouraring.com

Pretty comprehensive recent review https://www.wareable.com/health-and-wellbeing/oura-ring-2018...

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