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The study, funded by mobile phone companies, suggests radiation from the handset can cause insomnia, headaches and confusion.
It may also cut our amount of deep sleep - interfering with the body's ability to refresh itself.
The study was carried out by Sweden's Karolinska Institute and Wayne State University in the US.
Funded by the Mobile Manufacturers Forum, the scientists studied 35 men and 36 women aged between 18 and 45.
