Too many electronic gadgets in the bedroom lead to a host of health and social problems for teenagers, health specialists warn, even as some parents and teenagers choose to take light of the warning.

Health experts warn that gadgets, such as television, computers and musical devices, in the bedroom distract teenagers from getting enough sleep.

The survey found that a third of the 12 to 16-year-olds slept between four to seven hours a night, suffering from 'junk sleep'.

The average recommended sleep time for teenagers and adults is seven to eight hours, according to Dr Maxwell Kayed, clinical neurophysiologist who specialises in sleep disorders at British Medical Consulting Centre.

"The amount of sleep depends on the person, but most people need eight hours."