Short-term insomnia, often caused by travel or stress, usually improves once the stress is removed or after your body has adjusted to the new schedule. Short-term use of over-the-counter sleep remedies may help. Chronic insomnia, which disrupts sleep for extended periods of time, may call for a thorough physical exam, alteration of some lifestyle habits, medical treatment, and, perhaps, psychotherapy to identify a hidden cause. It is most important to treat any problem that is producing insomnia symptoms. Just treating insomnia symptoms without dealing with the main cause will not be helpful.