As trials are announced in Britain of a new preventative drug, Dr Chris van Tulleken explores the latest science around HIV, meeting health professionals, scientists, and individuals affected by the virus, in the UK and South Africa, challenging the myths and stigma surrounding it.

We are one of the most sleep-deprived countries in the world. In The Truth About Sleep, insomniac Michel Mosley finds out what happens if we don't get enough sleep and looks at surprising solutions to help us get more.

The World Health Organisation has described stress as 'the health epidemic of the 21st century'. In this programme Fiona Phillips wants to understand why we are experiencing increased amounts of stress in our lives and what actions we can take in order to reduce it.

Fiona explores some of the very latest scientific research behind stress and demonstrates a number of techniques and lifestyle changes which are designed to keep our high stress levels in check.