In this research, a questionnaire survey was made on 381 junior high school students and 1778 college students in Guangdong Province, and 350 valid questionnaires were collect-ed from the junior high school students and 880 were collected from the college students. It preliminarily learns about that the average age when youngsters sleep alone is 8.74±3.12 years old, and the age of girls is older than that of boys. The time for young-sters to sleep alone is correlated with their sense of security, and it reaches a statistical difference ( <0.05), namely, the earlier the time to sleep alone, the higher the sense of security is. Mean-while, it is found that the sense of security of youngsters who sleep alone with light on is lower than that of those who sleep with light off, and it shows a significant difference, so sleeping alone with light on can be regarded as a reflection of youngsters' low sense of security.%本研究通过对广东省381名初中生和1778名大学生进行问卷调查，共回收了有效问卷初中生350份，大学生880份。初步了解青少年的平均分床年龄为8.74±3.12岁，女性分床时间晚于男性。青少年的分床时间同安全感之间存在相关性，并达到统计学差异（P<0.05），即分床年龄越早，安全感越高。同时，研究发现独睡时开灯的青少年比不开灯的青少年安全感低，且达到显著性差异，因此可以把独睡开灯作为青少年安全感低的一个体现。
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