How well does Ambien work?
Onset of action: Studies show that the average time to falling asleep is within 30 minutes of taking Ambien. Affect on nighttime awakenings: A study of over 400 patients showed that the number of times patients awoke at night was decreased by 20% with Ambien compared to sugar pill. Affect on total sleep time: Patients in a 4 week study receiving Ambien reported significantly increased total sleep time compared to patients receiving sugar pill for all 4 weeks.