Ambien is a sedative used to treat the Ambien For insomnia treat. The short-term release tablet will help you sleep immediately when you first go to bed. The extended-release form, Ambien CR, has two layers. The first will dissolve quickly to help you sleep immediately, and the second layer will keep you asleep till morning. Ambien works by boosting GABA activity, a neurotransmitter in the brain. The neurotransmitter serves as a messenger between the neurons. These receptors will slow down the neuron's activity which results in insomnia. You can hassle-free buy Ambien online from an online pharmacy at a relatively lower price than the local stores with or without a prescription.