Revealed: The 5,000 device that tech billionaires Mark Zuckerberg and Elon Musk swear has led to their success

It is the gadget that billionaires Elon Musk and Mark Zuckerberg swear is the key to their success. Instead, billionaires and Silicon Valley elite are forking over thousands for high-tech mattresses to optimise their sleep. Eight Sleep, the startup behind these pricey smart beds, claims its mattresses can give you 25 per cent more deep sleep and even cure your snoring. The company's Pod product consists of a sensor-packed mattress cover which connects to a large'hub' and an adjustable base. This system constantly monitors the sleeper's body temperature and position, providing heating or cooling through an in-built water pump.