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Insomnia is one of the great obsessions of our time. Writers, artists, thinkers and leaders have always battled with sleep - from Van Gogh to Oscar Wilde, Winston Churchill to Margaret Thatcher. Shakespeare's night owls are legendary, from Lady Macbeth to Brutus, while Charles Dickens' insomnia took him on nocturnal walks in search of inspiration. But in our 24-hour culture, insomnia - this ability to switch off - has become something of a modern obsession, with today's writers and bloggers thinking nothing of tapping away at keyboards or pounding the streets for solace in the wee small hours.

In the first of this series, in which five night owls explore their own battles with sleeplessness, distinguished author Margaret Drabble looks at ageing and sleeplessness. She asks why, after years of insomnia, it's become something of an old friend to her, and extols the delights of the compensatory nap.

Producer: Justine Willett

First broadcast in October 2011.