Table E1.

Jenkins sleep scale (JSS) evaluated in the last month.

How often in the past month did you:		0	1	2	3	4	5
1.	Have trouble falling asleep	Not at all	1–3 days	4–7 days	8–14 days	15–21 days	22–31 days
2.	Wake up several times per night	Not at all	1–3 days	4–7 days	8–14 days	15–21 days	22–31 days
3.	Have trouble staying (including waking far too early)	Not at all	1–3 days	4–7 days	8–14 days	15–21 days	22–31 days
4.	Wake up after your usual amount of sleep feeling tired worn out	Not at all	1–3 days	4–7 days	8–14 days	15–21 days	22–31 days