The Berlin Questionnaire for Sleep Apnea consists of 3 categories related to the risk of having sleep apnea.
Construct Definition (and Source):
A natural and periodic state of rest during which consciousness of the world is suspended. (NCI)
Netzer, N. C., Stoohs, R. A., Netzer, C. M., Clark, K., & Strohl, K. P. (1999). Using the Berlin Questionnaire to identify patients at risk for the sleep apnea syndrome. Annals of internal medicine, 131(7), 485–491. https://doi.org/10.7326/0003-4819-131-7-199910050-00002