(Natural News) You see them everywhere. On the bus, in restaurants, at school, and at work. Every day, more people are staying glued to the screens of their mobile phones and gadgets. But 24/7 access to technology also has negative side effects, and a whopping 40 percent of teenagers don’t get enough sleep because of their devices, as reported by Science Daily.

The article revealed that because teenagers are on their phones most of the day, a lot of them don’t get enough sleep at night. According to sleep experts, an adolescent must sleep for at least nine hours at night to get the rest they need. Anything less than seven hours is deemed insufficient and can be the difference between excelling at school and being an unproductive student.

Jean Twenge, Professor of Psychology at San Diego State University, collaborated with psychologist Zlatan Krizan and Garrett Hisler, a graduate student. Both Krizan and Hisler are from Iowa State University in Ames. All three looked at data collated from “two long-running, nationally representative, government-funded surveys” undertaken by an estimated 360,000 teenagers.

Data from the Monitoring the Future survey asked 8th, 10th, and 12th graders in America how frequently they slept for at least seven hours each. Meanwhile, the Youth Risk Behavior Surveillance System survey asked 9th to 12th-grade students the average number of hours of sleep they got every school night.

Once the data from both surveys were gathered, the three researchers confirmed that in 2015, at least 40 percent of adolescents received less than seven hours of sleep each night. The result is alarming since it is 58 percent more than 1991’s results, and is 17 percent more than in 2009. (Related: Teenagers waste 40 days a year looking at mobile devices, startling research discovers.)…………More Here