US study shows teens prefer their smartphones to sleep

A  new study shows adolescents are out of charge in the classroom as they’re sacrificing sleep for more time on their smartphones.

A study led by San Diego State University Professor of Psychology Jean Twenge has found teenagers today are sleeping fewer hours per night than older generations.

Experts recommend they need nine hours of sleep each night to be engaged and productive in the classroom, and anything less than seven hours is considered insufficient.


More than 360,000 teenagers across the US were surveyed in 2015  about their sleeping habits with 40 per cent getting less than seven hours a night.

The data also showed the more time young people spent online, the less sleep they got.

Teens who spent five hours a day online were 50 per cent more likely to not sleep enough.

Professor Twenge believes the increase in students sleeping less is due to smartphones.

Previous research suggests light wavelengths emitted by smartphones and tablets can interfere with the body’s natural sleep-wake rhythm.