Huw Williams, Associate Professor of Clinical Neuropsychology at Exeter University spoke exclusively to Claudia Hammond about the implications of his study.

Twenty Four Hour Memory Loss:

A few years ago a film came out called 50 First Dates. It starred Drew Barrymore as a woman who had had a car accident which resulted in her losing her memory for the days' events every time she went to sleep. Now its happened in real life, a 48 year old woman asked Dr Christine Smith of the Department of Psychiatry at University of California San Diego for help. Dr Smith's account of this unusual case study has been published in the journal Neuropsychologia.

How to Stop Worrying:

Ad Kerkhof is a clinical psychologist at VU University in Amsterdam. He written a book aimed at any of us who worry, explaining how we can train ourselves to stop worrying.