It is common for young children to have a fever during the day but not at night. First of all, the body functions are more active during the day, and the resistance to viruses and bacteria is also stronger, so it is less likely to lead to fever symptoms. However, at night, the body’s functions are less active and are often in a state of rest, making it easy for a fever to occur. In addition, the body temperature is slightly higher at night than during the day, so if there is a mild increase in body temperature, it can easily turn into a fever. At this time it is very important to carry out treatment to reduce fever as well as anti-inflammatory treatment. It is necessary to find out the cause of the fever, such as viral infections, which need to be treated with antiviral drugs, and bacterial infections, which need to be treated with antibiotics. If the fever is particularly high and exceeds 38.5°C, it is still necessary to use ibuprofen suspension to reduce the fever, and acetaminophen suspension is also more effective.