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Professor Russell Foster is head of the Sleep and Circadian Neuroscience Institute at the University of Oxford, professor of circadian neuroscience and the director of the Nuffield Laboratory of Ophthalmology. An expert in sleep, he describes it as 'the single most important health behaviour we have'.

Born in 1959, as a child he loved his toy microscope and digging up fossils. Despite being labelled \\u201centirely non-academic\\u201d by his headmaster and attending remedial classes for some years, he achieved three science A levels which won him a place at the University of Bristol.

There, he developed an early interest in photo-receptors - cells which convert light into signals that can stimulate biological processes. This eventually led to his post-doctoral discovery, in 1991, of a previously unknown type of cell \\u2013 photosensitive retinal ganglion cells \\u2013 in the eyes of mice. His proposition that these ganglion cells \\u2013 which are not used for vision, but to detect brightness \\u2013 exist in humans too initially met with scepticism from the ophthalmological community.

Russell\\u2019s research has made a significant impact, proving that our eyes provide us with both our sense of vision and our sense of time, which has changed the clinical definition of blindness and the treatment of eye disease. He has published several popular science books.

Russell is married to Elizabeth Downes, with whom he has three grown-up children.

DISC ONE: Ode to Joy from the 4th movement of Symphony No. 9, conducted by Wilhelm Furtw\\xe4ngler, performed by Elisabeth Schwarzkopf, Elisabeth H\\xf6ngen, Hans Hopf, Otto Edelman and the Bayreuth Festival Orchestra \\nDISC TWO: Die Walk\\u03cbre Act 3, Finale, from Der Ring des Nibelungen, sung by Hans Hotter and performed by Vienna Philharmonic Orchestra and Vienna State Opera Chorus \\nDISC THREE: Don Giovanni, K. 527: Mi tradi quell'alma ingrata by Kiri Te Kanawa\\nDISC FOUR: Sweet Dreams (Are Made of This) by Eurythmics\\nDISC FIVE: (Nimrod): Adagio by BBC Symphony Orchestra \\nDISC SIX: Title: Chasing Sheep Is Best Left To Shepherds by The Michael Nyman Band\\nDISC SEVEN: The Mikado, Act II: The Sun Whose Rays by The D'Oyly Carte Opera Company\\nDISC EIGHT: Let\\u2019s Misbehave by Irving Aaronson

BOOK CHOICE: The collected works of Adrian John Desmond\\nLUXURY ITEM: A mask, snorkel, flippers and underwater camera\\nCASTAWAY'S FAVOURITE: Die Walk\\u03cbre Act 3, Finale, from Der Ring des Nibelungen, sung by Hans Hotter and performed by Vienna Philharmonic Orchestra and Vienna State Opera Chorus

Presenter: Lauren Laverne\\nProducer: Cathy Drysdale