# Research on the Application of the Dynamic Assisted Sleep Light to Smart Mobile Devices
## 2 Materials and Methods
### Experiment Process  
Because the purpose of this study is to evaluate the effect of generating dynamic sleep assist light in smart mobile devices without considering the influence of blue light on sleep in metamersim, the experimental method was the same as that of previous dynamic sleep assist lamps in most experimental controls.  
This study was divided into three sections, and each section had three parts, as shown in Figure 13. The first and third parts were tests of work efficiency, and the second part was the sleep experiment. At the end of the sleep experiment, a self-evaluation questionnaire was filled out, then all subjects slept in a dark environment in sequence, then in a dynamic light environment, and finally in a fixed color temperature 1900 K environment The work efficiency test takes common clerical work in the office as the experimental test method and adopts TQC Chinese typing verification practice software for typing tasks, and the test time of typing tasks was 10 min.  
The sleep test lasted for 1 h, and the sleep experimental light source came from an iPhone X, in which the backlight module unit is controlled. In each experiment, three different test light sources were respectively emitted, which were no light (dark), dynamic light, and fixed color temperature of 1900 K. The dark environment is an environment in which the backlight was turned off. In the dynamic light environment, we controlled the backlight module to set it at a fixed illumination of 5 lux, and the fixed color temperature was initially set at 1900 K and increased by 50 K every 0.5 s until 3800 K was maintained for 30 s, and then decreased by 50 K every 0.5 s until 1900 K was maintained for 60 s as a cycle. The effect of its dynamic light environment on melatonin is shown in Table 1. In the fixed color temperature of 1900 K environment, the light had a fixed illumination of 5 Lux and a color temperature of 1900 K, as shown in Figure 14.  
The subjective questionnaire scale of the experiment is shown in Table 2. 'I think the space is comfortable' indicates that subject's feelings about the environment and the comfort of the bed: very uncomfortable 1 point to very comfortable 5 points. 'The space is  
Figure 14: Dynamic color temperature.  
Figure 13: Experimental process. (The typing content topic is different every time, and each subject’s topic is random).  
too bright to fall asleep': the subject cannot feel the light for 1 point, and can fully feel the light for 5 points. 1 can sleep better in the experiment': poor sleep indicated by 1 point and good sleep by 5 points. 1 feel refresh after 1 wake up': the subject's mood is bad, 1 point, or is good, 5 points. 1 hope I can continue to sleep': the subject wishes to stop sleeping for 1 point, or wishes to continue sleeping for 5 point.  
Before the start of each experiment, the researchers set up a smart mobile device rack at the edge of the bed around the sleeping environment, placed the phone on the phone rack, and then adjusted it. Each time, according to the control of illuminance, researchers reconfirmed before entering the sleeping experiment, referring to the data on human head circumference in the anthropometric database of the Ministry of Labor of Taiwan Province, the illuminance of the smart mobile device to the human eye is measured to be 5 Lux [31], the measurement method is shown in Figure 15.  
\begin{table}
\begin{tabular}{c c c c c c} \hline
**Color Temperature** & **S-Cone-Opic** & **M-Cone-Opic** & **L-Cone-Opic** & **Rhodopic** & **Melanopic** \\ \hline
1900 K & 0.00 & 0.01 & 0.01 & 0.00 & 0.00 \\ \hline
1950 K & 0.00 & 0.00 & 0.01 & 0.00 & 0.00 \\ \hline
2000 K & 0.00 & 0.00 & 0.01