Ambien works by affecting the unbalanced chemicals in the brain that may be causing sleep problems. It is typically prescribed for short-term use, generally for 7 to 10 days, to help initiate sleep. Extended-release forms of Ambien (Ambien CR) may help individuals stay asleep longer. The recommended dosage varies depending on factors such as age, gender, and overall health. It's important to follow the prescribed dosage and instructions provided by the healthcare provider.