T. X. Gao, Y. Nagao, and K. Kume, “Quantitative Analysis of the Human Sleep Cycle Using Automatic Smoothing Filters”, IJRESM, vol. 4, no. 6, pp. 200–208, Jun. 2021, Accessed: Nov. 21, 2024. [Online]. Available: https://journal.ijresm.com/index.php/ijresm/article/view/876