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Item from Pittsburgh Sleep Quality Index. Buysse et. al 1989 (PubMed ID: 2748771) Search for all PSQI variables within this datasetOriginal question: During the past month, how many hours of actual sleep did you get each night?

Item from Pittsburgh Sleep Quality Index. Buysse et. al 1989 (PubMed ID: 2748771) Search for all PSQI variables within this dataset

Item from the Sleep Disorders Symptom Checklist - 25. Klingman et al 2017, Introducing the Sleep Disorders Symptom Checklist-25: A Primary Care Friendly and Comprehensive Screener for Sleep Disorders, Sleep Med Res 2017; 8(1): 17-25Search for all Sleep Disorders Symptom Checklist - 25 variables within this dataset

Item from Pittsburgh Sleep Quality Index. Buysse et. al 1989 (PubMed ID: 2748771)External semantic reference: CDEOriginal text: The following questions relate to your usual sleep habits during the past month only. Your answers should indicate the most accurate reply for the majority of days and nights in the past month. During the past month, how many hours of actual sleep did you get at night (this may be different than the number of hours you spend in bed)? Search for all PSQI variables within this dataset

Subscore based on 2 items from Pittsburgh Sleep Quality Index, with a range of 0-3. A score of "0" indicates no difficulty, while a score of "3" indicates severe difficulty. Buysse et. al 1989 (PubMed ID: 2748771) External semantic reference: CDE Search for all PSQI variables within this dataset Source: :psqi_2: , :psqi_5a:

Item calculated based on combined review of Split week self-assessment of sleep survey (SASS-Y) and the Munich Chronotype Questionnaire (MCTQ). Search for all SASS-Y/MCTQ variables within this dataset

Item calculated based on combined review of Split week self-assessment of sleep survey (SASS-Y) and the Munich Chronotype Questionnaire (MCTQ). Search for all SASS-Y/MCTQ variables within this dataset

Item calculated based on combined review of Split week self-assessment of sleep survey (SASS-Y) and the Munich Chronotype Questionnaire (MCTQ). Search for all SASS-Y/MCTQ variables within this dataset

Item calculated based on combined review of Split week self-assessment of sleep survey (SASS-Y) and the Munich Chronotype Questionnaire (MCTQ). Search for all SASS-Y/MCTQ variables within this dataset

How long did you sleep last night, Number of hours (number of hours, 0 to 24)

How long did you sleep last night, Number of minutes. (number of minutes, 0 to 59)