Obviously, there is a need for more study, but the methodology, where a group of volunteers were exposed to either 884 MHz signals, or to a sham signal, seems to be a pretty good study format.
I am not sure if this was single, or double blind. (in the latter, the researchers don't know who got the placebo either).
Definitive word to my mind:
Dr Chris Idzikowski, the director of the Edinburgh Sleep Centre, says: "There is now more than sufficient evidence, from a large number of reputable investigators who are finding that mobile phone exposure an hour before sleep adversely affects deep sleep."
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