The OURA ring is a biometric device that tracks an individual’s sleep and activity. The ring measures key body signals (e.g., resting heart rate, body temperature, heart rate variability, and respiratory rate) to generate daily sleep, activity, and readiness scores. The ring provides output values for several daytime and nighttime variables including daytime activity levels, naps, sleep stages, nighttime movement, and sleep timing and quality. The ring is paired to the OURA app through which information is conveyed to the user and regularly backed-up to the online cloud for users to compare trends and export data for further analyses.