January often feels like a month when we should be hibernating, emulating a dormouse or a hedgehog and tucking ourselves up ...

Sleeping with half of their brain at a time ... do that. So, if you see a dolphin hovering near the surface of the ocean with ...

From Dr Michael Breus’s chronotype animals to Dr Nerina Ramlakhan’s ‘sensitive’ and ‘Martini’ sliding scale, there are many ways to categorise the way we sleep. But which ones best ...