The goddess of the online world in the US, Arianna Huffington, famously described as the most upwardly mobile Greek since Icarus, has gone to sleep. Actually she is trying out an experiment to sleep for a minimum of 8 hours each night – and she has just ‘fallen off the wagon’ as she describes in her latest article on The Huffington Post.

How much sleep do you get? Do you need more? What about the power naps, the disco naps, the catnaps? Do they make you feel better or worse?