Ambien (zolpidem) and Lunesta (eszopiclone) are prescription sleep aids used to treat insomnia, but they differ slightly in how long they work and their side-effect profiles. Ambien is effective for helping users fall asleep quickly, while Lunesta works longer, helping with both sleep onset and sleep maintenance. Both drugs can cause dizziness, next-day drowsiness, and impaired coordination. Lunesta may lead to a metallic aftertaste, while Ambien is more commonly linked to sleepwalking or unusual sleep behaviors. Neither medication is meant for long-term use due to dependence risks. The best choice depends on sleep patterns and medical guidance.