Table 4.
Sleep Latency Questions
| Category | Study | Question Wording [Response Scale] | Context | Timeframe |
|---|---|---|---|---|
| Sleep Latency | Sleep Heart Health Study (SHHS) | During the past month, how long (in minutes) has it usually taken you to fall asleep each night? [MM] | Past month | |
| Sleep Latency | National Sleep Foundation: 2005 Adult Sleep Habits and Styles | How long, on most nights, does it take you to fall asleep? [HH:MM] | ||
| Sleep Latency | Framingham Heart Study | How long does it usually take you to fall asleep at bedtime? [HH:MM] | ||
| Sleep Latency | Survey of Midlife in Japan (MIDJA 2) | During the past month, how long (in minutes) has it taken you to fall asleep at night? | Past month | |
| Sleep Latency | National Health and Nutrition Examination Survey (NHANES) | How long does it usually take to fall asleep at bedtime? | ||
| Sleep Latency | Munich Chronotype Questionnaire (MCTQ) | On nights before workdays it takes me _______ mins to fall asleep | Work | |
| Sleep Latency | Munich Chronotype Questionnaire (MCTQ) | On nights before free days it takes me _____ mins to fall asleep | Free | |
| Sleep Latency | Munich Chronotype Questionnaire (MCTQ) | On nights before free days I generally fall asleep after no more than ______ min | Free | |
| Sleep Latency | Pittsburgh Sleep Quality Index (PSQI) | How long (in minutes) has it taken you to fall asleep each night? | ||
| Sleep Latency | Sleep Timing Questionnaire (STQ) | On most nights, how long, on average does it take you to fall asleep after you start trying? ______________ minutes | ||
| Sleep Latency | St Mary’s Hospital Sleep Questionnaire | How long did it take you to fall asleep last night? [HH:MM] | Last night | |
| Sleep Latency | Medical outcomes Study Sleep Scale (MOS-SS) | How long did it take you to fall asleep during the past 4 weeks? [1: 0–15minutes; 2: 16–30minutes; 3: 31–45 minutes; 4: 46–60 minutes; 5: More than 60 minutes] | Past 4 weeks | |
| Sleep Latency | Self-Assessment of Sleep Survey (SASS) | [During the previous week] How long did it take you to go to sleep, on average? [HH:MM] | Past week | |
| Sleep Latency | Split-Week Self-Assessment of Sleep Survey (SASS-Y) | [On WEEKDAYS during the previous week (Sunday night through Friday Morning)] How long did it take you to go to sleep, on average? [HH:MM] | Weekdays | Past week |
| Sleep Latency | Split-Week Self-Assessment of Sleep Survey (SASS-Y) | [On WEEKENDS during the previous week (Friday night through Sunday Morning)] How long did it take you to go to sleep, on average? [HH:MM] | Weekends | Past week |
| Sleep Latency | Basic Nordic Sleep Questionnaire (BNSQ) | How long time (how many minutes as an average) do you stay awake in bed before you fall asleep (after lights off)? During the working days it takes me about [MM] minutes before I fall asleep. | Work | |
| Sleep Latency | Basic Nordic Sleep Questionnaire (BNSQ) | How long time (how many minutes as an average) do you stay awake in bed before you fall asleep (after lights off)? During free time it takes me about [MM] minutes before I fall asleep. | Free | |
| Sleep Latency | Multi-Ethnic Study of Atherosclerosis (MESA) | How long does it usually take you to fall asleep at bedtime? |
Notes: A blank cell indicates that this component is not present in the question. The sentence case (e.g., all capitals) is displayed as represented on the survey. Sleep latency questions were all similarly defined, therefore there is no “Event Definition” column.