That study found radiation from mobile phones delays and reduces sleep and causes headaches and confusion.
The study is published by the Massachusetts Institute of Technology's Progress in Electromagnetics Research symposium and funded by the Mobile Manufacturers Forum. It found using handsets before bed causes people to take longer to reach the deeper stages of sleep and to spend less time in them. That, they say, interferes with the body's ability to repair damage suffered during the day.
The mobile phone companies are saying the studies results were inconclusive.