Someone who lack of sleep doesn’t mean that he/she have sleep problem, because some peoples do not sleep very much but awaken after a few hours of sleep full of energy and feeling well rested. If that is you, then you don't have to worry that you have insomnia, you just don't need so much sleep like you thinking. The most important is the quality of your sleep not quantity.
There are many potential causes insomnia or sleep problem such as, the side effect of medication, bad lifestyle habit, diseases, stress, depression, etc. And some research say that most of insomnia cases are linked to psychological causes like depression and stress.
The best treatment for insomnia depends on what kind of insomnia do you have. You must consult your physician for treatment. For people who are seeking advice on an effective insomnia treatment, it may be as simple as making some changes in lifestyle habit, such as following a regular sleep schedule to improve your sleep and the others it takes more research and more serious treatment. So, it’s depends of cause on your insomnia.
If you want to find more about insomnia, here a good resources for your references. You can find what kind and caused of insomnia and what is the best for sleepless problem treatment . But it’s only for references, you must consult your doctor for advices.

