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Available for over a year

Having trouble nodding off? A sleep-tracking kit called Sense which has raised more than $1 million on Kickstarter is just one of many bits of technology aiming to improve the way we sleep. But surely a good night’s sleep be achieved without specialist gear? Derkjan Dijk is Professor of Sleep and Physiology at University of Surrey. (Photo: A boy and pet dog fast asleep in this 50s picture, Credit: Getty Images)