Richards A, Kanady JC, Huie JR, et al. - Experts investigated the association between sleep term, time of day of task performance, and chronotype synchrony with performance in individuals aged 15–80 years using flanker-task performance scores from a large internet sample (N = 48,881) with repeated measures of cognitive performance and associated former-night self-reported sleep term. Outcomes designate a performance peak at 7 hr habitual sleep duration and direct to a variable impact of deviation from habitual sleep duration relying on users’ habitual sleep duration and age. For a consistent drop in performance up until 01:00 hours–02:00 hours for the group as a whole, time-of-day effects were significant which was accounted for by nighttime decline on trials needing inhibitory executive functioning, especially in the elderly people. Reviews did not exhibit a benefit for performing in synchrony with self-recognized chronotype. Results substantiate findings designating an inverted U-shaped association between sleep duration and cognitive performance over a broad spectrum of age groups. The significance of daytime task performance for tasks needing an inhibitory function, particularly in old individuals was emphasized by these findings. Moreover, the shed a light on the use of large-scale internet data in adding to sleep and circadian science.