The average Briton gets six-and-a-half hours' sleep a night, according to the Sleep Council. Katharina Wulff of the Nuffield Department of Clinical Neurosciences showed BBC journalist Michael Mosley what happens when we sleep.
How much can an extra hour's sleep change you?
- 9 October 2013
- Research
Senior Research Scientist Katharina Wulff explains what happens when we sleep.