参考答案

正确答案：A
解析：根据题干关键词need more sleep定位到原文第四分标题下第三句：If feeling tired in the afternoon is an everyday occurrence．if caffeine is a necessity，if you fall asleep within five minutes of your head hitting the pillow，you need more sleep!可知每天下午都感到疲惫、躺在床上很快入睡都是需要更多睡眠的标志。A项符合原文。