There is no scientific basis for the statement that you need to be wary of what kind of disease you are experiencing when you sleep with a sweaty neck at night. This is because neck sweating while sleeping at night can occur in a variety of ways. Neck sweating at night can be caused by factors such as higher room temperatures and thicker bedding. Consider that the sweat glands in the neck are more developed and when the temperature is higher, it increases the excretion of sweat from the neck, which leads to neck sweating while sleeping at night. Calcium deficiency, fever, pneumonia, tuberculosis, etc. may also cause night sweating in the neck, which may be accompanied by increased body temperature, weakness, and loss of appetite. However, neck sweating at night can occur in a variety of situations, and it is not possible to diagnose a certain disease by a single symptom.