The 16-year-old child always can’t get enough sleep means sleepiness, which may be caused by sleep apnea syndrome, sleep deprivation, heart failure and other reasons. 1. Sleep apnea syndrome: generally refers to sleep apnea hypoventilation index ≥5 times/hour. Patients often show symptoms such as snoring during night sleep, apnea witnessed by others, and daytime sleepiness. 2. Sleep deprivation: It may be caused by staying up late, excessive fatigue, decreased sleep quality, etc. Patients may suffer from sleep deprivation, which may cause drowsiness during the day. 3. Heart failure: refers to the syndrome of circulatory dysfunction mainly caused by myocardial diastolic and/or systolic dysfunction due to insufficient cardiac output to maintain the metabolic needs of the tissues under the condition of moderate venous return. It may be caused by myocarditis, coronary artery disease, etc. When the left heart appears to fail, symptoms such as lethargy, fatigue, and drowsiness appear due to the decrease in cardiac blood excretion. 16-year-old children always sleep not enough, may also be mental, learning stress and other causes, it is recommended to go to the hospital in a timely manner, follow the doctor’s instructions for treatment, to avoid delaying the condition.