Any information on insomnia would include its symptoms as well as causes. insomnia refers to a common sleeping disorder. This problem gets much more disturbing in case the sleeplessness attacks not just occasionally 
but every night. The symptoms would include a deep sleep for the first few hours, followed by waking up after just 2 to 3 hours. This is when a person will start to toss and turn, dwell on unimportant details, and may even become riveted on every normal night sound. To get back to sleep, will be a problem. As per the information on insomnia, other clues for having insomnia include general restlessness, problem in falling back asleep, besides a racing heartbeat.
You need to go through the information on insomnia in order to know about the factors which cause insomnia. The most common cause is stress. Besides, insomnia will hit when you are the busiest and do not have the time for this kind of problem. Another factor which may cause insomnia might be the environment in which you are sleeping. The room may be too noisy at night. This can be in case you sleep near a busy highway, or you may even be worried there may be a burglar in the house. You might even be suffering from insomnia because the moon is shining on your face during the night or because an animal has made some sound. Often, in case people hear a sound, they tend to stay awake since they are trying to hear that sound again. They may even become obsessed with that notion and then won’t go back to sleep until they have heard that sound again.
Once you collect all information on insomnia, and your insomnia is more chronic then occasional, then you would know that your insomnia isn’t just due to the above factors.