There's already so much technology out there to track your sleep or daily steps that it's hard to imagine where another would fit. But Doppel is part of a new breed of wearables; a wristband that instead of simply informing you about your mood, can actively change it too.

Whether swooping over sprawling landscapes or careering through space, an hour spent on Icaros – a virtual reality at-home gym that claims to exercise both mind and body – promises to be a truly holistic workout. Is this what the future of fitness looks like, or is it just another VR gimmick?

In the 50s we used to sleep eight hours a night. Nowadays the average is six and a half. Why have we become less keen on a proper night’s keep? Does our modern lifestyle promote sleep deprivation, meaning we’ll stay awake as long as it takes to consume as much online as possible?

An estimated 50 and 70 million adults in the US alone have a sleep disorder. And with problems with sleep leading to more serious health issus, there's growing interest in sleep tracking apps and devices that help people get as restful a sleep as possible.