Table 1 Criteria for establishing the presence of sleep difficulties in patients
No sleep difficulty symptoms | One sleep difficulty symptom | Two or more sleep difficulty symptoms |
|---|---|---|
Reporting none of the following: | Reporting one of the following: | Reporting two or more of the following: |
 · Difficulty falling asleep |  · Difficulty falling asleep |  · Difficulty falling asleep |
 · Difficulty staying asleep |  · Difficulty staying asleep |  · Difficulty staying asleep |
 · Waking too early |  · Waking too early |  · Waking too early |
 · Insomnia |  |  |
 · Sleep difficulties (any) |  |  |