Lunesta belong class of drug know as sedative-hypnotics, which work as a central nervous system (CNS) depressant. Its is precription sleep aid used to treat insomnia, a condition that makes it difficult to fall or stay asleep. The overdose of this painkiller can be addictive and take longer to recover. Its have the same common side effects, such as bad taste or dry mouth, drowsiness, dizziness, headaches and cold-like symptoms. If someone is addicated the should take the advice of a doctor or visit the nearest Rehab center check up.