Ambien (zolpidem) is a medication with a specific profile that makes it particularly effective for treating certain types of insomnia. Studies suggest that Ambien has a relatively mild impact on sleep architecture compared to some other sleep medications. It tends to preserve the natural stages of sleep, particularly deep sleep and REM sleep, which are important for restorative sleep. Ambien has a quick onset of action, usually within 15-30 minutes. This makes it effective for people who have trouble falling asleep.