If your two-year-old baby is drowsy, you should pay attention to whether there is lack of sleep or overexertion before sleep. If there is, you can let your baby observe the mental condition after waking up, and if he or she is in good spirits after waking up, there is nothing to worry about. If the baby sleeps for a long time and wakes up poorly or with fever, nausea, vomiting and other symptoms, you should be alert to central nervous system infections and go to the hospital in time. There are other pathological conditions that can cause drowsiness, such as hypoglycemia, drug intoxication, etc. Therefore, two-year-old babies can sleep for a long time under physiological or pathological conditions, so we should pay attention to the identification, and if necessary, go to the hospital, improve the relevant examination, and then make appropriate treatment in a timely manner.