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

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 https://ouraring.com Pretty comprehensive recent review https://www.wareable.com/health-and-wellbeing/oura-ring-2018-review-6628 https://www.wareable.com/health-and-wellbeing/oura-ring-2018...