"One of a parent's most treasured moments is to look in on a child who is sleeping peacefully. The value of sleep can be measured by your child's natural energy, smiling face, and happy nature during the daytime. Sleep is a vital part of how a child's body and mind grow and develop. Behavior or developmental problems can arise when a child does not sleep well. ..."
University of California Los Angeles' Sleep Disorder Clinic offers helpful information on sleep and children, including:
Problem signs
Bedtime routines
Common sleep problems in young children
Tips to help your child sleep better
Read the article: https://www.uclahealth.org/sleepcenter/sleep-and-children