Insomnia, or sleeplessness, is a sleep disorder in which there is an inability to fall asleep or to stay asleep as long as desired. Some of main symptoms of insomnia are : Difficulty falling asleep, Waking up often during the night and having trouble going back to sleep, Waking up too early in the morning, Feeling tired upon waking. All people experience some sleepless nights, but for other people this is the regular basis.
More informations at : http://io9.com/the-science-of-insomnia-506798525
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