The Effects of Lunch Time Napping on Habitual Nappers' Mental Work Efficiency in the Afternoon and Early Evening: An Empirical Study from China (Report‪)‬

1. INTRODUCTION Lunch time napping is very prevalent in China. The farmers often take LTN only in summer because they need avoid the hot sun's radiation at noon; however, more and more mental workers also take LTN, moreover, they usually take LTN all the year round, which can't be explained by the weather. An investigation in a university found that 71% teachers and 78% students are used to taking LTN more than 10 months a year; the respondents admitted that they won't perform well or work efficiently in the afternoon and evening without LTN. However, LTN also induced a lot of controversies, some people think that it leads to low work efficiency for that the continuity of eight hours work a day is interrupted by LTN. Besides, LTN extends the time between going to work and getting off work, especially for those whose home is far away from work site, such as the work time of not having HTL is often from 9:00 to 17:00, otherwise, it is usually from 8:00 to 17:30, which makes people feel more tired [1]. Dose not having LTN really lead to habitual nappers' mental work inefficiency?