This sport watch gives you several functions to keep track of different key metrics during the workout. Measure your sleep quality with the built-in sleep tracker. It weighs 32 g.
From Amazon
Garmin Forerunner 45S Small GPS Running Watch, with running features, Blue Lilac (Iris) Band
Gadcet
Garmin Forerunner 45S Running Watch - White, New
This product is also available at 2 unverified merchants.