Wake up in the middle of the night tinnitus, not tinnitus during the day, this tinnitus characteristics may be related to the tinnitus ringing smaller, the type of tinnitus and the loss of environmental noise masking at night and other factors. 1. Smaller tinnitus loudness: when the tinnitus loudness is relatively small, during the daytime due to distraction, autonomic perception is weakened, tinnitus can appear to be inconspicuous. When you wake up in the middle of the night, the environment is quiet, a slight tinnitus can also be clearly noticed. 2. Types of tinnitus: tinnitus often occurs with local blood pressure fluctuations, such as the mastoid conduit vein expansion, sigmoid sinus migration and jugular vein bulb elevation, often in the night when lying down when the venous return slows down, pulsatile tinnitus sound enhancement. During the day, people are in a standing position, relative venous resistance decreases, localized tinnitus is reduced, and tinnitus may not be obvious. 3. Loss of environmental noise masking: the presence of various frequencies of noise in the environment during the day, can varying degrees of masking the tinnitus sound, tinnitus is not strong during the day. At night, the environment is relatively quiet, and the tinnitus is more prominent when the environment is not masked by noise. This feature may be caused by other factors, and requires active medical treatment and systematic examination to clarify the diagnosis and cause of the disease.