Using technology before falling asleep can affect a student’s sleep pattern.[8] The blue light that is emitted from the screens of cell phones, computers, and other devices stops the production of melatonin.[8] Melatonin is a hormone that controls the sleep-wake cycle of the circadian rhythm.[8] This reduction of the amount of melatonin produced makes it harder to fall and stay asleep.[9] The National Sleep Foundation conducted a poll in 2011 and reported that approximately 90% of Americans used technology in the hour before bed.[10] The poll noted that young adults and teenagers were more likely to use cell phones, computers, and video game consoles than other adults.[10] Furthermore, 22% of participants reported going to sleep with cell phone ringers on in their bedroom and 10% reported awakenings in at least a few nights per week due to their cell phones' ringers.[10] Among those with the cell phone ringers on, being awakened by their cell phone was correlated to difficulty sustaining sleep.[10]