Buy Ambien Online Direct Home Delivery. This medicine is used to help prevent or ease drowsiness and sleeping problems, including trouble falling asleep, early waking in the morning, and difficulty staying asleep. This medication works by affecting chemicals in the brain that play a role in regulating sleep. Ambien increases your ability to sleep and decreases daytime sleepiness. These effects may cause you to fall asleep and wake up faster on the medication side effects. Ambien is in a group of drugs called sedative-hypnotics.