Insomnia is a term which has a number of numerous definitions that help in figuring out the prevalence of insomnia in people. These insomnia definitions were implied using numerous studies to analyze the prevalence using different criteria.

One of the definitions of insomnia uses a very simple criterion to identify people with insomnia. If an individual has problem sleeping at night then that person might be an insomniac. If an individual is dealing with difficulty in staying asleep or maintaining his or her sleep, then he might be an insomniac too. If a person wakes up way too early than he is supposed to, then he is perhaps an insomniac as he would not be achieving the required hours of sleep to make him functional all through the day. If a person stays asleep for the required number of hours and still feels tired after waking up then that means that his sleep is just not refreshing. In such a circumstance an individual may feel like he was relaxed when he went to sleep than when he woke up from sleep. This particular fourth criteria focused upon by this insomnia definition refers to the quality of sleep that a person is getting. If the quality of sleep is poor, then the individual may be referred to as an insomniac for he would feel fatigued and tired during the day even though he experiences being asleep the entire night.

The above mentioned criteria are used by many epidemiologists to identify a person with insomnia. This insomnia definition is also called the traditional means of identifying insomnia. Based on the studies executed, around one third of the general population has one of these symptoms.

Another definition of insomnia takes the above explained definition further by saying that a person to agree having one of the 4 criteria are likely to have some symptoms during the daytime to be categorized as an insomniac. If an individual experiences early morning awakenings for example, and is fresh and alert during the day displaying no signs of being unusually weary or fatigued, then his early morning awakenings could be simply because his required number of hours of sleep is certainly below what is prescribed.

According to this second insomnia definition, the tests performed found a nine percent to fifteen percent occurrence rate of insomnia in the general public. The second definition definitely minimizes the number of people who can be categorized as insomniacs.

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