Do you have a tired, lethargic, or moody teen? Silly question, right? But for real, a study published in November suggests mood swings and constant fatigue might be caused by blue light exposure during the hour leading up to a teen’s bedtime. The study, published through Uni Research Health in Bergen, Norway, suggests the blue light emitted from phones, laptops, and gaming consoles may have a direct effect on how long and how well a teen can fall asleep. The study, which followed more than 10,000 teens ranging from 16-19 years old, found the more time they spent on their devices, the harder it was for most teens to fall asleep or the greater the chance sleep was disturbed. On average, most teens are ignoring the National Sleep Foundation guidelines to avoid exercise, eating, drinking, or using screens an hour before bedtime. Although this doesn’t seem like a big deal, unhealthy sleeping habits potentially link to depression, increased anxiety, poor school performance, and more emotional disturbances in adolescents. The recommended screen usage time is approximately two hours per day, but the study conducted on the Norwegian teens found girls were reporting about five-and-a-half hours of screen time usage per day and boys averaged almost seven hours. Using any device before bed saw a 13-52 percent increase in needing more than 60 minutes to fall asleep. The study also found the more the teens used these devices before bedtime, the more of a chance their sleep was disturbed. It is suggested having a set bedtime and monitoring the use of screens at night could be useful in promoting balance and wellness.