Strengths and Limitations
SECONDARY
This study has several strengths. These strengths primarily centered on the randomized crossover trial design, wherein each child participant was able to act as their own control, with the sleep extension week providing the conditions for more sleep opportunity compared with the sleep restriction week that provided less sleep opportunity. We determined the difference in sleep on the basis of actigraphy rather than subjective measures of sleep duration, which should provide greater accuracy.This study also has limitations. It focused on a secondary outcome of interest, for which we did not undertake specific power calculations. Although data collection had to be concluded slightly earlier than anticipated due to COVID-19 restrictions, the total dropout rate was low at 5% compared with the projected rate of at least 20%,