Firstbeat Analytics provides algorithms to Garmin and other Smart/Fitness-Watch makers. For example, they provide the algorithm that predicts Sleep Cycles from

Firstbeat Analytics provides algorithms to Garmin and other Smart/Fitness-Watch makers. For example, they provide the algorithm that predicts Sleep Cycles from Heart Rate Variability [1]. [1] (PDF) https://assets.firstbeat.com/firstbeat/uploads/2019/11/Firstbeat-Sleep-Solution_white-paper_short.pdf https://assets.firstbeat.com/firstbeat/uploads/2019/11/First...