| nc001 | In the past week, on how many nights did you wake up during the night (not counting your final wake-up in the morning)? | on how many nights did you wake up during the night |
| nc002 | Thinking about the nights when you woke up in the past week, how much difficulty did you usually have falling back asleep? | how much difficulty usually falling back asleep |
| nc003a | Wearing a smartwatch or other wearable device at night to track sleep | Wearing a smartwatch or other wearable device at night to track sleep |
| nc003b | Answering a brief survey on your smartphone when you have difficulty falling back asleep | Answering a brief survey on your smartphone when you have difficulty falling back asleep |
| nc003c | Completing a sleep log in the morning about your nighttime experience | Completing a sleep log in the morning about your nighttime experience |