Buy Lunesta Online to Get Delivered on the Same Day. Lunesta is the Classes of sedative-hypnotics. It is used for insomnia disorder. Insomnia is caused due to the lack of sleep. When a person is not asleep for a long time and while he/she does some work in sleep or tired i.e called in insomnia. Lunesta is relaxing our body for a better or healthy sleep It will take before going to bed .