Lunesta is basically used to treat sleep disorders such as insomnia. It is so far the best medicine that is prescribed against insomnia. The medicine works on those chemicals present in the brain which are responsible for the development of insomnia. Insomnia is one such sleep related disorder that could be a result of stress and pressure. Insomnia is generally characterized by sleeping nights having a negative impact on the following day. The drug has a specific function of acting upon the secretory action of the cells of the brain thus balancing the chemical composition of the brain that is required to induce sleep during the right time. FDA has approved it and so one can be assured that lunesta is safe for the human body. You can now enjoy uninterrupted sleep and feel fresh after taking lunesta. However, FDA also has approved it for long use as long as it is taken in the right doses.