PHILADELPHIA (CBS) – Australian researchers say late night phone use has a devastating impact on teens’ sleep quality and mental health, according to a WWL report.

The study, with 1,100 Australian high school students included, showed that with increased phone use at night, teens may be led to feeling depressed and having low self-esteem.

Michelle Moore, a clinical psychologist at LSU Health Sciences Center in New Orleans, says she is not surprised by the study’s findings, adding many teens may be getting just half the sleep necessary.

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For this reason, Moore encourages parents of teens to tell their kids to put their phones down.

“Set a bedtime,” she said. “Set a curfew. All phones stay in the kitchen area and are not allowed in the bedroom areas.”