Ambien functions by enhancing the activity of gamma-aminobutyric acid (GABA), a neurotransmitter in the brain that produces a calming effect. By binding to GABA receptors, Ambien slows down brain activity, allowing individuals to fall asleep more easily. This mechanism makes it effective in managing insomnia, especially for those who have trouble initiating sleep. Ambien’s effects begin rapidly, usually within 15 to 30 minutes of ingestion, and its short half-life limits morning drowsiness. The medication should be taken only when a full night’s sleep (7–8 hours) is possible.