This medication is used to treat insomnia, panic, and anxiety attacks. It is the best medicine for sleeping disorders. If you have heart problems, breathing disorders, mental illnesses, etc. in these cases Lunesta is strictly prohibited. Always try to buy Lunesta from an authorized company. Feeling sleepy, headache, vomiting, running nose, and cough are the common side effects of Lunesta. This is a sleeping pill that helps to give calm and stress-free sleep and is used for the treatment of symptoms of insomnia and anxiety disorder. Lunesta 3mg is basically prescribed to be taken just before you go to sleep.