Choose your sources wisely:
Middle School - Gale in Context has many types of resources within it: encyclopedia articles, magazine articles, videos, images, and more. Your searches can bring you up a lot of results; be sure to take your time and determine what you are looking for (Reference, Biographies, Primary Sources, Magazines, and Images are good options).
Smartphone addiction could be changing your brain
Survey: Parents worry over kids' device addiction
Blue light & sleep (article in link, video below)
Britannica has a lot of good, basic information. On each of the topics, be sure to try the "Related topics" or "Web's Best Sites" to research your topic even further.