0NobodyInParticularBest Answer 10 years ago ReplyUpvoteMore than likely, the problem is not a prank device. It is possible that you are hearing something like a ballast on a fluorescent light, a malfunctioning TV, some kind of motor, or even an actual mosquito of the six-legged kind.If this is the case, you can either hunt down the source of the noise or cover it up. "Waterfall noise" is perhaps the best way to cover it. You can find a program to create some, pink.exe in the Release folder of this zip file from the September 2005 CSIG Meeting.But there is another explanation that is unfortunately quite likely... If the sound sensors in your inner ear become severely damaged, whether by loud sounds, infection, a physical blow, old age, or some other cause, the nerves that they were attached to start misbehaving. It is like the TV blasting out static when the cable or antenna comes unplugged. The condition is known as tinnitus and is not uncommon. If you start hearing a high-pitched noise at a disturbing volume whenever you relax in any quiet location, you need to consult a hearing specialist or ear/nose/throat specialist. (The fix might be as simple as an expert scooping out some wax that home remedies could not reach without damaging your eardrum.) But do not wait for the problem to go away. Some people develop problems with tinnitus that so seriously disrupt their lives that they are driven in desparation to waste money on crazy snake oil 'remedies'.So if the problem is medical, get a doctor to check it out. If it is not medical, then you need to get a recording of it and lodge some complaints with neighbors and/or maintenance staff.