*adapted from Jenkins CD, Stanton BA, Niemcryk SJ, Rose RM. A scale for the estimation of sleep problems in clinical research. J Clin Epidemiol. 1988;41(4):313-21. doi: 10.1016/0895-4356(88)90138-2. PMID: 3351539.
https://pubmed.ncbi.nlm.nih.gov/3351539/