Table 1.

Sleep problems, with sample questions, 3-month prevalence rates. Number of observation= 6,533^*, age= 9-16.

Sleep problems, with sample questions	N of observations	Weighted prevalence: %	95% Confidence Interval
1. Difficulty falling asleep: “Is it hard to fall asleep when you want to? How long does it take?”	468	7.0	6.4, 9.3
2. Waking in the middle of the night: “Once you're off to sleep, do you wake up again in the night? Can you get back to sleep again easily?”	145	2.2	1.4, 2.9
3. Early morning awakening: “Do you wake up early in the morning and can't go back to sleep?”	201	2.9	2.2, 3.6
4. Hypersomnia: “Do you feel sleepy during the day? More than most people?”	163	2.1	1.5, 2.6
5. Nightmares: “Do you have bad dreams or nightmares? Do they wake you?”	396	5.6	4.5, 6.7
6. Restless sleep: “Do you sleep soundly/ Do you toss and turn?”	714	10.8	9.2, 12.5
7. Inadequately rested by sleep: “Are you fairly well rested when you get up?”	123	2.6	1.8, 3.4
8. Tiredness: “Have you been feeling especially tired or weary? How much of the time have you felt like that?”	135	2.6	1.8, 3.4
9. Fatigability, exhaustion: “Do you feel exhausted by things that would have been no problem before?”	118	2.0	1.3, 2.6
10. Somnambulism (parent report): “Does s/he ever walk in his/her sleep?”	236	2.9	2.0, 3.7
11. Night terrors (parent report): “Does s/he ever seem to be having a terrible dream, but doesn't wake up?”	156	1.8	1.2, 2.4
No sleep problems in past 3 months	4,669	73.9	71.6, 76.2
1 or more sleep problem	1,864	26.1	23.8, 28.4
2 or more sleep problems	906	12.4	11.1, 14.5

^*Missing sleep data: N = 139.