BBC World Service: The Forum: Insomnia

Do you find it difficult to get a good night's sleep? If so, you are not alone. According to the US National Institutes of Health, between 6 and 30 percent of adults suffer from insomnia, or lack of restorative sleep. Since the establishment of sleep medicine a century ago, we have learnt a lot about what causes sleeplessness. And yet, as the never-ending proliferation of sleep aids demonstrates, its prevalence remains high. Encore broadcast.