The purpose of this study is to explore the treatment of Low Level Light Therapy(LLLT) mitigate possible insomnia and psychological symptoms, when nurses have taken shifts.The investigators hope that the goal of this interventional research is to improve sleep quality and psychological symptoms of shift nurses in order to promote health.
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psychological symptoms
Timeframe: 1 month,up to 4 weeks.measure every 1 week.Change from baseline DASS-21 at 1,2,3,4 weeks, a total of five times.