There is substantial research indicating that screens interfere with sleep patterns. Screen time often delays the time that children go to sleep because they are using screens. Another underlying reason is that exposure to the light emissions from screens increases alertness and interferes with our sleep-wake cycles. A good night's sleep is essential for learning and memories to consolidate information and for students to perform at their highest levels the next day. Children with anxiety, depression and executive function weaknesses are often prone to sleep problems, and these students should make extra effort to have a good sleep routine. Awareness of the potential negative impact of screens, and efforts to reduce this impact, can have very positive effects.