Lunesta is only used for short term periods, approximately 1-2 weeks or less. If you are wondering, is Lunesta a controlled substance? Let me tell you that Lunesta is also known as Eszopiclone. It is provided for treating Insomnia and other Sleeping problems. It has other variations like 1 mg of Lunesta , 2 mg of Lunesta & 3 mg of Lunesta. So, now Bid adieu to those restless nights. Change your lifestyle and maintain your health by correcting your Sleep Cycle.