"The varying extent to which activities such as taking a nap, drinking a cup of coffee, or going for a short walk contribute to subsequent vigilance behind the wheel are not well understood and are therefore recommended for further study," they say.

UK road safety experts say the only real cure for fatigue is sleep.

A spokesman for the Department for Transport said: "Driving tired significantly increases the risk of an accident so we encourage drivers to ensure they are properly rested before climbing behind the wheel.

"Drivers should get a good night's sleep, plan sufficient breaks and pull over if they feel tired.

"The Highway Code is clear that the most effective way to counter sleepiness while driving is to have, for example, two caffeinated drinks and take a short nap."

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