Francine Stock talks to the sleep scientist Matthew Walker whose latest book is a clarion call to get more sleep, as the latest research confirms that sleeping less than six or seven hours has a devastating impact on physical and mental health.

Armed with proof that shift work is detrimental for workers, political strategist and chief executive of the RSA Matthew Taylor considers what responsibility companies have to their staff in making sure they get enough sleep and whether since industrialisation modern working practices militate against this.

Concerns about lack of sleep and remedies for improving it are nothing new: the historian Sasha Handley looks back to early modern sleep patterns and advice, and wonders why so many of our forebears slept in two distinct phases with an hour in the early hours set aside for sex, housework or reading.

The latest exhibition at the National Gallery, Reflections, co-curated by Susan Foister, shows how the medieval painter van Eyck had a huge influence on the Pre-Raphaelite painters, whose work stood in opposition to creeping industrialisation and harked back to a by-gone era of knights and sweet slumber.

Producer: Hannah Sander.