According to Traditional Chinese Medicine, the body's Yang energy changes throughout different times of the day. In the morning, our Yang energy begins to rise, reaching its peak at noon, and in the evening, it is stored back within the body. Waking up at night is usually in the late night or early morning. If you drink cold water at this time, it can affect the rise of Yang energy the next day. From a Western medicine perspective, human body temperature also varies at different times of the day. Body temperature is generally lower at night, and drinking cold water after waking up is not conducive to blood circulation. This is especially true for people with heart and gastrointestinal diseases, who should absolutely not drink cold water after waking up, as it can easily trigger illnesses.
If you are thirsty after waking up at night, you can drink some warm water, usually about half a cup or one cup. This helps promote blood circulation, prevent cardiovascular diseases, and is less likely to irritate the stomach and cardiovascular system. Additionally, oral bacteria multiply slowly at night. Research has found that the optimal temperature for tooth metabolism is 35°C, so you should rinse your mouth with warm water before drinking.