Parents of teenagers with falling grades at school needn't look further than their child's smartphone.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/instant-messaging-night-affects-childs-grades-sleep-study
[2] http://admin.indiaenvironmentportal.org.in/category/author/malathy-iyer
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/child-health
[5] http://admin.indiaenvironmentportal.org.in/thesaurus/mobile-phone
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health