Sleeping at night and itching inside the ear may be clinically associated with the following diseases: 1. It may be more commonly seen as fungal otitis externa, induced by a fungal infection in the ear canal. Patients may have a history of accompanying foot odor, which may have a strong relationship due to foot odor infecting the ear. In some patients, such as long-term application of antibiotic ear drops or long-term intravenous antibiotic infusion, resulting in secondary infection is also possible. 2. Eczema of the external auditory canal, such patients may have allergies to what they eat or contact with allergens, induced by eczema of the ear canal, accompanied by the performance of yellow water flowing from the ear canal. This condition can be treated with oral antihistamine medication and anti-allergy medication applied inside the ear canal. 3. Some patients may have earwax in the ear canal, for example, and the itchy ear may be irritated.