Some really unfortunate insomniacs may even be allergic to electromagnetic energy.
A recent study published by the National Sleep Foundation found that 43% of Americans between the ages of 13-64 rarely or never get a good night's sleep on weeknights. 60% said they have a problem with sleep every night, or almost every night.
At the same time, 95% use some kind of electronics in the hour before bed at least a few nights per week.
Here's where the problems crop up; artificial light exposure can suppress the release of melatonin.
That being said, some technologies are worse than others - televisions for example, are passively received (like that last episode of American Idol that put you in a trance-like state). Others, such as text messaging and video games are considered more dangerous to your sleep as they are interactive - therefore, they are more likely to disrupt the sleep-onset process.
I always recommend avoiding anything with an on/off switch for at least an hour before going to bed. That being said, I know that for some, technology helps them sleep.
Some members of my insomnia help forums need the TV on to help them relax. Others find it impossible to sleep without a marathon session of Bejeweled.
We're all different - and that's why there is no universal insomnia cure.
Source: National Sleep Foundation