Table 1.

Insomnia severity index items (scores of each item is 0–4; 0 = no problem or difficulty; 4 = very severe problem).

Item no.	Question
1	Rate the current (i.e., last 2 weeks) severity of your insomnia problem(s)
1-a	Difficulty falling asleep
1-b	Difficulty staying asleep
1-c	Problems waking up too early
2	How satisfied/dissatisfied are you with your current sleep pattern?
3	To what extent do you consider your sleep problem to interfere with your daily functioning
4	How noticeable to others do you think your sleeping problem is in terms of impairing the quality of your life?
5	How worried/distressed are you about your current sleep problem?