A new survey by Pew Research Center surveyed kids between the ages of 13 and 17 in the United States to look at the actual habits and impacts of their use of social media:
http://nymag.com/intelligencer/2018/11/american-teenagers-social-media-study.html
http://www.pewinternet.org/2018/11/28/teens-social-media-habits-and-experiences/
And a study out of Villanova University surveyed students about their cell phone use during sleep, as well as the location of their phone at night, their sleep quality and their number of hours of sleep both on a school night and over the weekend:
https://www.ctvnews.ca/health/sleep-texting-on-the-rise-among-teenagers-study-1.4196063
https://www.tandfonline.com/doi/abs/10.1080/07448481.2018.1499655?journalCode=vach20&
