I've got headage when wifi is on, why?

Electrosensitivity: Wifi is a form of radiofrequency radiation that is known to cause a variety of symptoms including headache, difficulty concentrating and insomnia in a certain percentage of people. See http://www.Townsendletter.Com/july2007/wifi0707.Htm it is estimated 2-3% of people suffer from hypersensitivity to electromagnetic fields from wifi, cell towers etc. More info at http://www.Electrosensitivity.Org/.