Worried that your teenager seems unhappy, and/or sleep deprived, much of the time? If your first impulse is to go online to look for help, you might want to take a step back.

The answer you seek may not be on the Internet. It may actually be the Internet.

Two large-scale studies released this week offer compelling, if not definitive, evidence that too much time spent online is harmful to adolescents’ physical and/or emotional health. Canadian researchers report the more time teens spend online, the more likely they are to get too little sleep.

And an American research team finds psychological well-being of American adolescents “suddenly declined in 2012” and continued a downward trend through 2016. During that same period, smartphone ownership increased rapidly, from 50 percent of the United States’ population to 77 percent.

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