Chronic insomnia can be further classified into adjustment insomnia, which is, there's a known triggering factor, it's lasting a little bit longer than one month. Psychophysiological insomnia, where the person is left with behaviors or sleep habits that further perpetuate their insomnia. Paradoxical insomnia, when a person may be sleeping a lot more than they think. Insomnia due to mental disorders, which is usually anxiety or depression. And insomnia due to medical disorders, such as diabetes, thyroid problems, hypertension. You can also have insomnia due to inadequate sleep hygiene. Many people don't practice good sleep habits, and that will lead to insomnia at night... .