Gao, Tian Xiang, Yuka Nagao, and Kazuhiko Kume. “Quantitative Analysis of the Human Sleep Cycle Using Automatic Smoothing Filters”. International Journal of Research in Engineering, Science and Management 4, no. 6 (June 20, 2021): 200–208. Accessed May 5, 2024. https://journal.ijresm.com/index.php/ijresm/article/view/876.