There was an interesting study done recently (about a year ago) in Sweden by some high school girls. For their science fair they decide to test the dangers of having a cell phone near their bed at night.
It was found a router gave off the same level of radiation so they used this instead of a cell phone for their experiment.
They placed several cress plants (a small leaf plant) in a room with the router and other in another room without radiation as a control.
The result was the plants in the room with the router, died. The students won an award for their findings and it so impressed a neurosurgeon that he is beginning further research into this.