[Ragnarok]

It basically means you can't sleep...

It is not unusual to have sleep troubles from time to time. But, if you feel that you do not get enough sleep or satisfying sleep, you may have insomnia, a sleep disorder. People with insomnia have one or more of the following:

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difficulty falling asleep;
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waking up often during the night and having trouble going back to sleep;
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waking up too early in the morning;
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unrefreshing sleep.

Insomnia can cause problems during the day, such as sleepiness, fatigue, difficulty concentrating, and irritability. A person with insomnia may also have another sleep disorder such as sleep apnea, narcolepsy, and restless legs syndrome.

Insomnia is not defined by the number of hours you sleep every night. The amount of sleep a person needs varies. While most people need between 7 and 8 hours of sleep a night, some people do well with less, and some need more.

About 60 million Americans each year suffer from insomnia, which can lead to serious sleep deficits and problems. Insomnia tends to increase with age and affects about 40 percent of women and 30 percent of men.