Israel study: excess smartphone, social media use leads to stress symptoms Tel Aviv University School of Dental Medicine researchers say physical symptoms may include teeth-grinding, mouth muscle and jaw pain, sleeping problems, drowsiness and fatigue TPS | Published: 03.14.21 , 21:07 A new study carried out at Tel Aviv University’s Maurice and Gabriela Goldschleger School of Dental Medicine has found that the excessive use of smartphones and social media can lead to problems sleeping, drowsiness and fatigue during the day, teeth-grinding, and pain in the mouth muscles and jaws. The stud...