In outpatient clinics, patients often complain that they do not feel strong tinnitus during the day, but feel it clearly at night when they sleep, or that tinnitus has increased. In fact, this is not really an increase in tinnitus, but a lifting of the external inhibition of tinnitus. Here, we may have to start with the phenomenon that tinnitus can be masked by external noises. When it is late at night, all the noises during the day are gone, especially before going to bed, so it can be said that everything is silent. At this time, the masking effect of external noises on tinnitus during the day is lifted, and the tinnitus becomes more prominent. Therefore, the subjective feeling of the patient is that the tinnitus has become louder, i.e., he complains that the tinnitus has increased.