According to a research study earlier this year which got little attention on this side of the Atlantic, mobile phones send out radiation that hampers people's ability to sink into the deep stages of sleep. Scientists from Karolinska Institute and Uppsala University in Sweden, and from Wayne State University in Michigan, gathered 35 men and 36 women between the ages of 18 and 45 and exposed about half of them to 884-megaherz wireless signals identical to those emitted by cell phones. The other half got no radiation. The result: The people who had been subjected to the radiation took longer to enter the deep stage of sleep that refreshes and restores, and spent less time there, than the other group.
What about Wi-Fi computer signals? Can they interfere with sleep? The scientific jury is still out, but consider this: Kevin Koym, who owns a consulting company and a software engineering firm in Austin, Tex., says of his struggles with insomnia: "I never had sleep problems until I started using Wi-Fi So now I am careful to shut off my computer at home in the evening."
Now I am sure you should have good valid reason to off your gadgets i.e. cell phone, Wi-Fi etc. to the sake of good sleep. Consider also for your kids should they sleep with you in the same room. We got total 3 cell phones including Pei's.......so imagine the high radiation! So, be wise off them.