Sleep plays an essential role in physical health, mental well-being, memory, concentration, and daily functioning. However, many people experience insomnia, a condition characterized by difficulty falling asleep, staying asleep, or obtaining restorative sleep. When sleep problems become persistent, healthcare professionals may consider behavioral interventions, lifestyle changes, and, in selected circumstances, prescription medicines. Lunesta, the brand name for eszopiclone, is a prescription medication used for the treatment of insomnia.