Statistical Analysis
REGRESSION
All analyses were undertaken in Stata, version 17.0 (StataCorp LLC). Effects of mild sleep deprivation were estimated by mixed-effects regression models, with the child as a random effect. Mean differences and 95% CIs were determined for sleep restriction compared with sleep extension. Standardized mean differences (SMDs) and 95% CIs were also calculated using a pooled SD. Residuals of models were plotted and visually assessed for homoskedasticity and normality. Complete case analyses were undertaken using the full sample (intention to treat) and were restricted to those who met the per-protocol a priori definition of a difference in sleep of at least 30 minutes per night.Two-sided 