Mass mind-control counter measures: input needed

[Yorkie]

Does anyone hear this weird noise when there is complete silence? It is sounds like a beep with frequencies changing. I can hear it for good 10 years or more. First I thought I can hear kind of voltage in the electric devices but I can hear it even if everything is off.
Does it mean there are some frequencies used to keep us asleep? Or I should contact my GP? ;-))

I will stay rather with mind control option.