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What makes you feel more energised, productive and happier? Whilst many would answer the question with perhaps caffeine, a yoga session or flexible working, countless research points to something less obvious, but surprisingly, free – sleep.

Whilst sleep has several health benefits, with a lack of precious slumber increasing the risk of obesity, heart disease and diabetes, and a shorter life expectancy, it’s also good for the economy.

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According to research, the annual cost of a lack of sleep to the UK economy is £40billion. And, as an employee, it’s also good for your bank balance. A study from the University of California at San Diego and Williams College in Massachusetts found that by adding one extra hour of sleep per night, wages could be boosted by five per cent.

However, several Britons are failing to get the recommended seven - nine hours of kip per night. A recent survey from Hillary’s found that only 11% of the UK workforce thought they were getting enough sleep - with stress and caffeine intake two of the most common reasons for this.