What is the new National Sleep Foundation survey on?

参考解析：

推理判断题。根据关键词“National Sleep Foundation”定位到第一段，根据第一段第二句和第三句“According to a new survey（调查）by the National Sleep Foundation, 51% of kids aged 10 to 18 go to bed at 10 pm or later on school nights, even though they have to get up early. Last year the Foundation reported that nearly 60% of 7-to 12-year-olds said they felt tired during the day, and 15% said they had fallen asleep at school.”中列举的数据可知美国有51%的10到18岁的孩子上床时间偏晚，近60%的7至12岁儿童表示他们白天感到疲劳，15%表示他们在学校睡着了。可以推测出这项调查是关于美国孩子的睡眠习惯的。故选A。