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The electromagnetic fields influence production of some hormones such as melatonin (which normally reacts to light and plays a role in our resting while sleeping) and the body cannot take the rest and refresh as good as it should.
The note about clock radio (plugged into the eletricity net) next to your bed is actually a good point - it too has its negative (albeit small) effects. There are large epidemiological studies done years ago in UK and elsewhere just on this topics (effect of electric appliances close to your bed).
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