Sleep and the Effect on Grades
Most children need at least nine hours of restful sleep each night. However, for many reasons, school-aged children may receive less than the recommended amount. The reasons for this shortfall include the working, eating, and bedtime patterns of students and their families, early school-start times, and childhood sleep disorders (such as disrupted sleep from snoring
or breathing pauses).
Many adolescents and pre-adolescents (more than 40%, in many research studies) do not get adequate amounts of sleep. In one study of 1,000 students (grades 9-12), 90% reported feeling groggy from lack of sleep. And there is evidence that grogginess affects school performance.
In another study comparing 150 high school students with high GPAs with their peers with lower GPAs, most of the higher-GPA students awakened later on school days, awoke earlier on weekends, had fewer night-time awakenings and other signs of good sleep habits.Google+