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Are you super old maybe...?Another posibility is these stupid sound systems you use against mice and stuff...You almost cant hear them as they are working on pretty high frequencie but when having them around for too long it affects your hearing abilities, too.and because you almost can'T hear some of those sounds, they sound like 10dB but actually are at 60dB or something like that...(for your hearing ability, they're similar to living next to a busy street, despite the fact you just almost dont hear it because of the higgh frequencies)maybe your neighbors used such a thing for a few years?