Assessing ‘readiness’ by tracking fluctuations in daily sleep and their effects on mood, motivation

Night by night variability in sleep duration has a significant effect on next day (but not next, next day) mood, motivation and sleepiness. This lends credence to the issuance of ‘readiness’ scores by consumer wearables. The work also supports the value of sleep regularity in giving better scores on these three markers of wellbeing.