Now, glasses that prevent jet lag and insomnia

The high-tech glasses emit a soft green glow which works on the human body clock to change our sleep patterns.

Using the device, called the Re-Timer, means long-haul air passengers can step off the plane feeling fresh, even after flying over long distances, say the sleep researchers who created it.

Inventor of the glasses, Professor Leon Lack said the glasses could also help insomnia sufferers, keep shift workers more alert and get teenagers out of bed in the morning, the 'Daily Mail' reported.

"The light from Re-Timer stimulates the part of the brain responsible for regulating the 24-hour body clock.

"Using a light device allows you to transition your body clock to a new time zone in small steps. This eliminates the sudden change people experience after flying and reduces the symptoms of jet lag," said Lack from Flinders University in Adelaide, South Australia.

Scientists say the light exposure changes the behaviour of a gland at the base of the brain which controls the body clock.

It sends signals to the rest of the body, triggering the production of hormones, which create daily cycles known as circadian rhythms.

Those who want to sleep and wake up early should wear the device for 50 minutes in the morning, while those who want to sleep and wake late should wear them for 50 minutes

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