As the years pass, it can become harder to get a good night's rest. The most common sleep disorder in middle-aged and older adults is chronic insomnia, which for many translates to around three years of relatively sleepless nights. A new study suggests a popular, gentle exercise may improve sleep as effectively as the top insomnia therapy. Hong Kong University exercise physiologist Parco M. Siu and colleagues compared the first-line treatment for this sleep disorder, cognitive behavioral