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Table 2 Sleep habits of the study subjects.

From: Sleep habits and sleep problems among Palestinian students

No. Variable Statistics*
1. When do you usually go to bed?  
     1. < 10 pm 124 (31%)
     2. 10 - 12 pm 109 (27.3%)
     3. > 12 pm 167 (41.7%)
2. How many hours of sleep do you usually have? 6.4 ± 1.1
3. When do you usually wake up?  
     1. < 6 am 72 (18%)
     2. 6 - 8 am 189 (47.3%)
     3. > 8 am 139 (34.7%)
4. Do you drink coffee late at night?  
     1. Never 234 (58.5%)
     2. < once per week 53 (13.2%)
     3. 1 - 2 per week 43 (10.85)
     4. 3 - 5 per week 27 (6.8%)
     5. nightly 43 (10.8%)
5. Have you ever taken sleeping pills  
     1. < once per week 14 (3.5%)
     2. Never 386 (96.5%)