Lunesta works by binding to certain receptors in the brain to enhance the effects of GABA and promote sleep. It is usually taken orally and should be swallowed whole, without crushing or chewing. Lunesta typically takes effect within 30 minutes to an hour after ingestion. It has a relatively long half-life of about 6 hours, which means it can help individuals fall asleep and stay asleep throughout the night. However, it can also cause side effects such as drowsiness, dizziness, headache, dry mouth, and unpleasant taste. Lunesta, like other sleep medications, should be used for a short period