Random walk model simulates the increased drowsiness of children with obstructive sleep apnea Shu Guo, Hila Dvir, Shlomo Havlin, Daqing Li, Rui Kang and Ronny P. Bartsch EPL, 129 6 (2020) 60002 Published online: 10 April 2020 DOI: 10.1209/0295-5075/129/60002