Insomnia affects up to 48% of the population at some point in their lives. There is a growing body of evidence linking insomnia to health problems and this has been added to by researchers at the University of Montreal who studied 13 otherwise-healthy insomniacs and 13 people without sleep problems. They found that the people with insomnia had higher night-time blood pressure, something which can lead to cardiovascular problems as this is when the heart normally has a 'rest' in people who sleep well.
You can find out more about this research at
http://www.sciencedaily.com/releases/2009/09/090904165238.htm
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