Excessive sleepiness is not a common clinical manifestation of nephrotic syndrome; generally, patients with nephrotic syndrome rarely exhibit excessive sleepiness. If a patient does display sleepiness, it is necessary to investigate the causes, such as a reduction in blood volume and decreased blood pressure caused by nephrotic syndrome, leading to insufficient cerebral blood supply. Furthermore, in cases of nephrotic syndrome, the patient’s immune capacity decreases, making them more susceptible to various infections, such as infections of the upper respiratory tract and lungs. When inflamed, patients are also likely to feel excessively sleepy. In some patients, there is a risk of cerebral infarction, which can also cause sleepiness.