Table 1.

Demographic and sleep variables for all three groups.

Variable	6th–8th Grade (n = 98)	9th–11th Grade (n = 67)	College (n = 64)
Grade point average	3.3 (0.7–4.0)	3.0 (0.5–4.0)	3.4 (2.0–4.0)
Average age (range)	13.2 (11–15)	15.5 (14–18)	27.8 (17–59)
Gender
Female	49.0	53.7	26.6
Male	51.0	46.3	73.4
Ethnicity
Hispanic	54.9	53.1	9.4
White	37.4	34.4	54.7
African American	0.0	1.6	23.4
Other	7.7	10.0	12.5
Do you feel you get enough sleep?
Never or rarely (one time per month)	26.5	37.3	42.2
Sometimes/occasionally (1–2 times/wk)	40.8	40.3	51.6
Always (every night)	32.7	22.4	6.2
Do you have difficulty falling asleep?	60.2	59.7	56.2
Do you have restless/aching legs when falling asleep?	24.5	26.9	28.1
Do you snore?	31.2	17.9	36.5
Do you stop breathing or have trouble breathing when sleeping?	3.1	4.6	17.5
Do you have leg kicks or twitches at night?	37.8	29.9	41.3
Do you wake at night and have trouble falling back to sleep?	38.8	26.9	53.2
Is it hard to wake up in the morning?	76.5	67.2	71.9
Do you wake unrefreshed/tired in the morning?	82.7	81.8	82.8
Do you have trouble with sleepiness during the day?	40.2	53.7	71.9
Do you fall asleep in class?	15.3	17.9	29.7
Do you have difficulty concentrating during the day?	53.6	56.1	57.8
Do you take naps?	34.0	56.7	34.4
Do you take sleep medication?	4.1	4.5	17.2