Insomnia Cures

I was just wondering what the signs of insomnia were because i have trouble falling asleep and when i do i either wake up around 5 am and cant fall asleep again or i get a lot of sleep and wake up tired as hell, and this is after tossing and turning for hours which seems to be necessary for me to fall asleep nowadays? i was wondering if it also only effects a certain age group or if all people can get it?
do only adults get affected or can teenagers also be affected by insomnia, becuase this is my fourth night in a row waking up at around 5am, and when or if i do fall back asleep i wake up later on in the day even more tired

"Insomnia is a symptom of a sleeping disorder characterized by persistent difficulty falling asleep or staying asleep despite the opportunity. It is typically followed by functional impairment while awake."

"The National Sleep Foundation’s 2002 Sleep in America poll showed that 58% of adults in the U.S. experienced symptoms of insomnia a few nights a week or more."

Check out the Wiki page, there is lots more information on there.