The drug is very effective in treating insomnia, to improve brain function in hypoxic patients, and to improve the conditions of patients who have brain injuries. The drug has also been recommended for use with patients that are in a minimally vegetative state to promote them into a more conscious state. The drug has several beneficial effects that are still under research. The most common use that doctors use it for is to treat insomnia but unfortunately the drug does tend to cause addition and dependence. In an effort to get the same comfortable nine hours of sleep, patients tend to up the dosage themselves without the consent of a doctor resulting in a involuntary overdose ambien problems. Overdose on ambien could also result in an rebound insomnia problem when the drug was discontinued. Recent studies have also shown that patients who regularly use overdose ambien medications can get addicted to it as it has a higher tendency or tolerance.