The Effectiveness of Using Low-level Light Therapy to Treat Sleep and Psychological Symptoms Among Shift-work Nurses：A Randomized-controlled Trial

Low-Level Light Therapy; LLLT is also called PhotoBioModulation; PBM, which is a new type of interventional therapy.LLLT applies low-level lasers or light-emitting diodes(LEDs) to the human body for treatment. The wavelength of irradiated light is between red light(630-700 nm) and near-infrared light(700nm-1,100nm), and leads to a positive biological effect. It is a safe, painless, non-invasive treatment method. When LLLT is applied to the brain, it can pass through the scalp, head bone and reach the brain, and then stimulating the photochemical reaction in the cells, This is called transcranial Low-Level Laser Therapy (t-LLLT) or transcranial Photobiomodulation(t-PBM). tLLLT has existed since 1967, and more than thousands of scientific studies have shown that photons can stimulate biological responses and promote the normal work of cells. t-LLLT can treat a variety of diseases, such as emotional symptoms, lower back pain, weight loss, skin anti-aging, wound healing, etc. There are no reports of side effects. The main mechanism is similar to the photosynthesis of plants. It absorbs light and produces chemical reactions, supports mitochondrial function, and significantly increases the production of ATP(the main carrier of energy in cells.)in the brain, so as to function work better and achieve self-repair. This research uses Dr. Tai's energy cap, the manufacturer is Topunion Globaltek Inc., which passed the certification of the Ministry of Health and Welfare(MOHW) for medical device in 2019. It has been modified to the second generation and is now on the market. It basically provides two kinds of red light (wavelength of 660nm) and near-infrared light(wavelength of 850nm), which is mainly used at home. The research intervention will be conducted for four weeks, pre-tests and post-tests will be conducted as indicators to evaluating sleep and psychological symptoms.