14岁男孩凌晨5点起床写作业突然晕倒，妈妈：事发时，已久坐约5个小时……

Group 1 - A 14-year-old boy in Changde, Hunan, fainted after long hours of studying, having started his homework around 5 or 6 AM and sitting for four to five hours straight [1] - The boy's mother, Ms. Zheng, reported that she was initially shocked and did not react quickly when her son fainted, but fortunately, he did not suffer any other injuries [1] - The incident highlights the risks associated with prolonged sitting, fatigue, dehydration, or low blood sugar, which can lead to transient cerebral ischemia, resulting in dizziness or fainting [3]