There three kinds of insomnia:
-Transient Insomnia: it is the first stage of insomnia, where a person is not getting enough sleep for a week.
-Acute Insomnia: It is the second stage of insomnia, where a person is not getting enough sleep for the last three weeks.
-Chronic Insomnia: It is the last stage of insomnia, where a person is not getting enough sleep from last one year and it can be proven very dangerous for the person.

Now look at the symptoms of Insomnia-
-The major symptom of having insomnia is pain in eyelids, eyes seems watery and painful. Suddenly you realize dark circles under your eyes. You will feel tried and irritated.
-Memory loss, lack of concentration and body pain. Insomnia can decrease your digestion power.