What can cure insomnia?

Insomnia: First you need to have an evaluation to know what's causing the insomnia -- otherwise it won't be treated effectively. For instance, it may be related to anxiety disorders, life stress, trauma, or depression. Also there are other disorders such as sleep apnea and restless legs syndrome. Medications can cause it; alcohol use can cause it. See your family physician to get help started.

Depends: The previous answer is a very good one and correct. In most cases anxiety is the mediator. Consider anxiety predominant nightime hyperarousal. Several drug classes may be helpful. Trazodone, gabapentin. Z-drugs (ambien, lunesta), and the benzodiazepines are all used but follow the previous advise. Some docs aren't comfortable treating insomnia, not viewing it as part of an anxiety spectrum.