Baby toddler love to sleep after the emergency rash, may be due to excessive energy consumption, viral encephalitis and other factors. 1. Excessive energy consumption: baby toddler emergency rash is usually caused by viral infections, after the disease baby will appear high fever, body temperature is usually as high as 39 ℃ or more, which will make the baby sweat a lot, thus consuming the body’s energy, so that the baby appeared lack of energy, the symptoms of sleepy. 2. viral encephalitis: toddler emergency rash is mainly caused by human herpes virus type 6 infection, when the virus stimulates the brain through the blood circulation, it may cause viral encephalitis, which will make the baby appear sleepy. The baby sleepy after toddler emergency rash, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.