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It runs counter to previous research that suggested excessive screen time was linked to children failing to get sufficient rest. The survey concluded that the relationship between sleep and screen use in children was "extremely modest". But one UK GP said the findings did not tally with his clinical experience.

The study, conducted by the Oxford Internet Institute, relied on data from a 2016 US study into children's health, in which parents from across the country completed surveys about their households.

The children's "digital screen time" was based on answers to two questions about the weekday habits of children aged between six months and 17 years: how much time they spent on computers, mobile phones, handheld video games and other electronic devices and how much time they spent in front of a TV watching programmes and other content as well as playing video games.

The findings indicate that the tech-abstaining teenagers slept only slightly longer than their counterparts who had spent much of their day in front of a screen. For example, teenagers who had not been in front of a screen for any part of the day got a total of eight hours and 51 minutes of sleep. Those who had spent eight hours of their day glued to a screen got eight hours and 21 minutes of slumber.

The sample size for the survey was more than 50,000 youngsters from every state in the US.

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