The temperature of cold pillow and ice pillow is too cold, which will cause sudden stimulation to the head and brain of human body, thus causing cerebrovascular diseases. Moreover, long-term use of these cold pillows and ice pillows will make people sleep on too soft pillows for a long time, and may also lead to cervical spondylosis unconsciously. Therefore, Dr. Wang suggested that citizens should use ordinary pillows to sleep peacefully; Even if you sleep with a cold pillow, you should also pay attention to the fact that the temperature of the cold pillow cannot be too different from the body temperature.
Because the water pillow has no constant temperature protection, if it is used for a long time, the temperature of the blood vessels in the head will be too low, and even the head will be paralyzed for a long time (I tried). As for what disease you will get, it seems that there is no institution to study it for the time being. Therefore, it is recommended that the use time should not exceed 8 hours (if the blood gas is not strong, the use time should not exceed 3 hours).