Zolpidem extended-release 12.5 mg, taken three to seven nights per week for up to six months, provided sustained and significant improvements in sleep onset and maintenance, and also improved next-day concentration and morning sleepiness in people with insomnia. The study focused on 1,018 patients between 18 and 64 years of age with chronic primary insomnia, who had difficulty initiating or maintaining sleep or experiencing non-restorative sleep for three months or greater. [click link for full article]