ESZOPICLONE treats insomnia. It helps you go to sleep faster and stay asleep through the night. It is often used for a short period. Buy Lunesta Online Overnight – Eszopiclone, marketed by Sepracor under the brand name Lunesta, is a nonbenzodiazepine hypnotic that is slightly effective for insomnia. Similarly, Eszopiclone is the active dextrorotatory stereoisomer of zopiclone and belongs to the class of drugs known as cyclopyrrolones. Eszopiclone is a short-acting nonbenzodiazepine sedative-hypnotic. All clinical trials of eszopiclone published so far have been funded by the manufacturer of eszopiclone, Sepracor.