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Table 1 Distribution of students by bedtime habit frequency response of "often" and by performance.

From: "Sleepiness" is serious in adolescence: Two surveys of 3235 Canadian students

   Hamilton Wentworth Grand Erie
   All n(%) ESS =>10 All n(%) ESS =>10
n   2201 900 1034 433
Gender M 1177 (53.5) 462 (51.3) 467 (45.2%) 189 (43.6)
  F 1024 (46.5) 438 (48.7) 567 (54.8%) 244 (56.4)
Bedtime habit     
Consistent pattern   627 (28.5) 208 (23.1) 299 (28.9) 87 (20.1)
Up late to study   287 (13.0) 145 (16.1) 132 (12.8) 73 (16.9)
Caffeine after 6 P.M.   774 (35.2) 331 (36.7) 432 (41.8) 200 (46.2)
Smoke before bed   301 (13.7) 152 (16.9) 115 (11.1) 70 (16.2)
Eat before bed   577 (26.2) 264 (29.3) 285 (27.6) 154 (35.7)
Performance     
Grades down   501 (22.7) 302 (33.5) 252 (24.4) 154 (36.7)
Late past month   1037 (47.1) 504 (55.9) 404 (39.1) 228 (52.7)
Extremely sleep at school   245 (13.4) 205 (22.8) 149 (14.4) 108 (24.9)
Decreased activities   373 (16.9) 235 (26.1) 188 (18.2) 126 (29.1)
Miss social sports   434 (19.9) 270 (30.0) 218 (21.1) 138 (31.4)