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Insomnia comes in many forms and worries people of all ages, most commonly for just a night or two, but sometimes for weeks, months, and even years. Insomnia has many causes. Insomnia is a symptom, much like fever or stomachache. There three symptoms commonly shown by people who have insomnia: difficulty falling asleep, no problem falling asleep but difficulty staying asleep with many awakenings, and waking up too early. Difficulty sleeping at night may be related with the following daytime symptoms: sleepiness, anxiety, impaired memory, impaired concentration, and irritability.

There are three basic types of insomnia. The first type is called transient insomnia -- lasting for up to several nights and is usually caused by excitement or stress. Adults may sleep poorly before a key meeting at work or after a quarrel with his or her partner. Many people sleep worse than usual for the first night or two away from home, particularly if they have traveled across many time zones. Nighttime strong physical movements, the flu or other brief illnesses may disrupt sleep temporarily.

The second one is situational insomnia. That is two or three weeks of poor sleep and is often developed during ongoing stress at work or at home. Situations such as job delay, divorced, serious illness or death are primary in this type of insomnia. Relief from the situation that provoked disturbed sleep or accommodation to it usually returns a person to his or her usual sleeping pattern.

Chronic insomnia is the third and most serious type of the sleeping problems. This sleeping problem lasts for three weeks or longer with poor sleep every night, most nights, or quite a lot of nights of a month. This is a complex disorder with many possible causes. In more than half of all cases of persistent insomnia the cause appears to be a physical illness, such as disorders of breathing or muscle activity. These figures were derived from a...