Sleep aid is first agent not limited to short-term use

Insomnia is one of the most common sleep disturbances in the United States, affecting an estimated 100 million Americans. According to the 2002 Sleep in America poll from the National Sleep Foundation, 58% of adults experience symptoms of insomnia a few nights or more per week at some point in their lives. The total economic costs associated with insomnia have been estimated at $17.5 billion.