Table 2.

Sleep questionnaire, scale of individual sleep questions, and composite score subdivisions.

Sleep Question	Scale	Composite
1. How many hours do you usually get at night?		Sleep efficiency
2. How often do you have trouble falling asleep?	1 to 5	Sleep efficiency
3. How often do you have trouble waking up during the night?	1 to 5	Sleep efficiency
4. How often do you have trouble waking up too early and not being able to fall asleep again?	1 to 5	Sleep efficiency
5. When you awaken during the night, how often do you urinate?	1 to 4	Nocturia
6. How often do you snore in any way?	1 to 5	Snoring
7. What time do you typically go to bed at night?		Sleep efficiency
8. What time do you typically wake up in the morning?		Sleep efficiency
9. How often do you have a night full of intense, vivid dreams?	1 to 5	Dreams/Nightmares
10. How often do you have nightmares (frightening dreams)?	1 to 5	Dreams/Nightmares
11. At bedtime, how often does restlessness in your legs delay your falling asleep?	1 to 4	Restless Legs
12. When you wake up during the night, how often do you feel unpleasant sensations in the leg muscles that require you to move your legs or walk in order to be comfortable?	1 to 4	Restless Legs

Questions 2–4, 6, 9–10: 1 = never, 2=A few times, 3=Sometimes, 4=Quite often, 5=Usually, 6=Don’t know. Question 5: 1=Once, 2=Twice, 3=Three Times, 4=Four or more times. Questions 11–12: 1=Never, 2=Occasionally, 3=Often, 4=Very often