Studies have shown that sleep is critical to students' functioning at school. School psychologists can effectively assess sleep habits in only a few minutes and can often improve students' sleep with brief interventions. This article reviews the importance of sleep and provides school psychologists with strategies for assessment and intervention. This article also provides a brief discussion of several sleep disorders (e.g., obstructive sleep apnea, parasomnias, restless legs syndrome, narcolepsy) that may require referral to a medical provider.