4. Sleep

Evidence-based, information-rich and full of smart tips and techniques, this series delivers a practical and optimistic guide to boosting brain power throughout our lives.

Drawing on the latest neurological research into protecting and preserving cognitive function, journalist and broadcaster Sian Williams, currently studying for an MSc in Psychology, investigates the best ways to avert, and in some cases even reverse, mental deterioration.

This time Sian analyses the importance of sleep to brain health.

With:

* Professor Angela Clow
* Dr Hannah Critchlow
* Neuropsychologist Dr Catherine Loveday
* Her mum, Scilla, a former Consultant Psychiatrist who's using exercise to combat her memory loss.

Producer: Dixi Stewart

First broadcast on BBC Radio 4 in August 2015.