Table 5.
Items of the SPQ (insomnia/irregular sleep schedule)
| No | Item |
|---|---|
| 1 | I suffer because I have difficulties initiating sleep |
| 2 | I suffer because I have difficulties maintaining sleep |
| 3 | I suffer because I wake up in the early morning and I am not able to return to sleep |
| 4 | My sleep disturbance causes significant distress or impairment |
| 5 | My sleep problems occur at least three times per week |
| 6 | My sleep problems last longer than 1 month |
| 7 | I sleep at least three times in 24 hours |
| 8 | Daytime sleepiness reduces my quality of life |
| 9 | I voluntarily (ie, not due to shift work) sleep in irregular patterns |
| 10 | My sleep problems are not mainly caused by bad sleep hygiene (ie, bright light) |
| 11 | My sleep problems are not mainly caused by substance abuse (ie, alcohol) |
| 12 | My sleep problems are not mainly caused by pharmaceuticals |
Abbreviation: SPQ, Sleep Problems Questionnaire.