Large cognitive fluctuations surrounding sleep in daily living

Cognitive output and physical activity levels fluctuate surrounding sleep. The ubiquitous digitization of behavior via smartphones is a promising avenue for addressing how these fluctuations occur in daily living. Here, we logged smartphone touchscreen interactions to proxy cognitive contrasted patterns on wrist-worn actigraphy. We found that both activities were dominated by diurnal (∼24 h) infra-radian (∼7 days) rhythms. measures performance-tapping speed, unlocking app locating speed-contained lower-powered rhythm than activity. difference between was vivid during bedtime as people continued interact with their at rest. performance this period worse those the hour before or after bedtime. suggest rhythms underlying real world are distinct from activity, discord may be hallmark modern human behavior.