Fig. 2

a Estimated Marginal Means for Snack Delay, Hands version task at 30 months, for each sleep group at 6 months. This graph represents the Estimated Marginal Means for Inhibitory control at 30 months, for each sleep variable based on the 10th, 10-90th and 90th percentiles, at 6 months. Y axis represents the estimated marginal means for the inhibitory control measure at 30 months and X axis the three sleep groups. Error bars represent the 95% Confidence Interval. The sleep variables represented here are: nighttime sleep duration (A), daytime sleep duration (B), total sleep duration (C), proportion of daytime sleep (D), number of night awakenings per night (E) and time awake during night (F). At 6 months, we can observe a clear linear association between total sleep duration (C) and IC, while a clear inverted U-shaped association was found between nighttime sleep duration (A) and IC. Finally, a trend towards an existing U-shaped association was found in daytime sleep duration (B) and proportion of daytime sleep (D), and towards and inverted U-shaped association in number of night awakenings (E) and time awake at night (F). b Estimated Marginal Means for Snack Delay, Hands version task at 30 months, for each sleep group at 12 months. This graph represents the Estimated Marginal Means for Inhibitory control at 30 months, for each sleep variable based on the 10th, 10-90th and 90th percentiles, at 12 months. Y axis represents the estimated marginal means for the inhibitory control measure at 30 months and X axis the three sleep groups. Error bars represent the 95% Confidence Interval. The sleep variables represented here are: nighttime sleep duration (G), daytime sleep duration (H), total sleep duration (I), proportion of daytime sleep (J), number of night awakenings per night (K) and time awake during night (L). At 12 months, a linear association between total sleep duration (I) and IC was found. Inverted U-shaped associations were reported in daytime sleep duration (H) and proportion of daytime sleep (J), while a trend towards U-shaped relation was found in nighttime sleep duration (G), number of night awakenings (K) and time awake at night (L)