​​Lunesta is the brand name for eszopiclone, a prescription medication for insomnia. It helps induce sleep faster and keep you asleep longer. Lunesta is a powerful sedative with a high potential for misuse.5 It affects the nervous system and alters brain chemicals like gamma-aminobutyric acid (GABA). Hypnotic agents like Lunesta will improve insomnia if taken in the proper doses as directed by your healthcare provider.