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A person using Smartphone, Wikimedia

Using mobile phones or watching TV in a dark bedroom just ahead of bedtime can sabotage your sleep more than when used in a well lit room or not using them at all, researchers say.

“While previous research has shown a link between screen use and the quality and length of young people’s sleep, ours is the first study to show how room lighting can further influence this,” said lead author Michael Mireku from the University of Lincoln in the UK.


Insufficient sleep is associated with impaired immune responses, depression, anxiety and obesity in children and adolescents.

The study, published in the journal Environment International, found that night-time use of phones, tablets and laptops is consistently associated with poor sleep quality, insufficient sleep, and poor perceived quality of life.


Insufficient sleep is associated with impaired immune responses, depression, anxiety and obesity in children and adolescents. . Pixabay

For the study, the research team collected data from 6,616 adolescents aged between 11 and 12 and more than 70 per cent reported using at least one screen-based device within one hour of their bedtime.

They were asked to self-report a range of factors including their device use in both lit and darkened rooms, their weekday and weekend bedtimes, how difficult they found it to go to sleep and their wake up times.

The results showed that those who used a phone or watched television in a room with a light on were 31 per cent more likely to get less sleep than those who didn’t use a screen.


Using mobile phones or watching TV in a dark bedroom just ahead of bedtime can sabotage your sleep. VOA

Also Read:Alzheimer’s Linked To Improper Sleep In Elderly: Study
The likelihood increased to 147 per cent if the same activity took place in the dark.

It has been reported that globally, 90 per cent of adolescents are not sleeping the recommended nine to 11 hours per night, which has coincided with an increase in the use of screen-based media devices.

Previous studies have shown that sufficient sleep duration and quality are vital in childhood to maintain physical and mental development. (IANS)


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Photo by Wikimedia Commons

Japan launched its new satellite, QZS-1R.

Japan has successfully launched a new navigation satellite into orbit that will replace its decade-old navigation satellite.

The satellite, QZS-1R, was launched onboard an H-2A rocket that lifted off from the Tanegashima Space Center at 10.19 p.m. on Monday night, Mitsubishi Heavy Industries said in a statement.

The company builds and operates H-2A rockets the Japan Aerospace Exploration Agency (JAXA).

QZS-1R is a replacement for Quasi-Zenith Satellite System 1 satellite first launched in 2010. “It was a really beautiful launch," the company said in a tweet after a successful lift-off.

"H-IIA F44 flight proceeded nominally. Approximately 28 minutes 6 seconds after launch, as planned, the payload separated from the launch vehicle," the statement said.

The official QZSS website lists four satellites in the constellation: QZS-1, QZS-2, QZS-3 and QZS-4, Space.com reported.

The QZSS constellation will eventually consist of a total of seven satellites that fly in an orbit passing through a near-zenith (or directly overhead) above Japan, and QZS-R1 is meant to share nearly the same transmission signals as recent GPS satellites, according to JAXA.

It is specially optimised for mountainous and urban regions in Japan, JAXA said.

Mitsubishi's H-2A 202 rocket launch system has been operational since 2003 and has sent satellites to locations such as Venus (Akatsuki) and Mars (Emirates Mars Mission).

The latest H2-A rocket launch is the first since November 29, 2020, when Japan launched an advanced relay satellite with laser communications tech into orbit, the report said. (IANS/JB)


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