Symptoms of WiFi over exposure?

I work from home - have an office with a latop, and a 2nd laptop on a desk directly behind me along with a wireless printer. So essentially I have 3 wifi devices in front of and back of me within 2 feet. I sit at my desk for 10-12 hours a day working (with frequent breaks of course). Been doing this for about 3 years now. Prior to this worked in a corporate office in front of a hard-wired computer.

For about the last 3-4 months I have constantly had this mild headache - kinda like you feel when you sleep too much. On top of that when I go to bed at night I can't fall asleep. I used to be totally out within 10 minutes of hitting the pillow - now my brain is going a thousand miles an hour with all these random thoughts like I'm on speed. I feel like I just drank a Starbucks coffee. When I do finally fall asleep it is like I'm never really asleep - always kinda half-aware with an active thought process going on. I wake up at least 4-5 times a night. It is totally bizarre. I never had a problem sleeping in my entire life and all of a sudden this is happening.

I started thinking about possible influences - I used to drink a lot of coffee, but never after 10:00am. Switched to decaf, so that' not it. Don't drink a lot of soda - may 2-3 week. Don't eat late at night - nothing has changed in my habits. So I starting thinking maybe my brain waves are being affected by the wifi?

As funny as it seems I also thought about 2012 and us passing through the dark rift and the increased gamma ray exposure we all may be getting....

Does anyone have any SCIENTIFIC references about wifi exposure and the related symptoms?

Thanks in advance.