age
0 = 20-22
1 = 23-26

2. Current academic year
2 = Second Year
3 = Third Year
4 = Fourth Year
5 = Fifth Year

0 = 2-3
1 = 4-5

3. Gender
1 = Male
2 = Female

4. Ethnicity
1 = Malay
2 = Chinese
3 = Indian
4 = Other

0 = Malay
1 = Others

5. Parents' income
1 = B40 (<RM4,850)
2 = M40 (RM4,851-RM10,970)
3 = T20 (>RM10,971)

Parents income
0 = <=5000
1 = >5000

7. Marital Status
1 = Single
2 = Married

0 = Underweight
1 = Normal
2 = Overweight/ Obese

10. Place of study
1 = Universiti Sains Malaysia (USM)
2 = Universiti Malaya (UM)
3 = International Islamic University Malaysia (IIUM)
4 = Universiti Teknologi MARA (UiTM)

11. Where do you live?
1 = Student Accommodation/ Hostel
2 = Rental/ Family house

12. Do you have any medical problems?
1 = Yes
2 = No

2.Frequency of exercise for the past one month.
1 = >5 times per week
2 = 3-5 times per week
3 = <3 times per week

0 = 0-3
1 = 4-7

1. How do you perceive your overall academic performance for the past one month?
1 = Very good
2 = Good
3 = Average
4 = Poor
5 = Very Poor

0 = very good/good
1 = average
2 = poor

3. Do you fallen asleep during class for the past one month?
1 = Never
2 = Seldom
3 = Sometimes
4 = Often
5 = Very often

0 = never
1 = seldom/sometimes
2 = often/very often

0 = 15>=x>=0
1 = 30>=x>15
2 = 60>=x>30
3 = x>60

0 = Not during the past month
1 = Less than once a week
2 = Once or twice a week
3 = Three or more times a week

6. During the past one month, how would you rate your sleep quality overall?
0 = Very good
1 = Fairly good
2 = Fairly bad
3 = Very bad

10.Do you have a roommate or housemate?
0 = No roommate
1 = Roommate in other room (Housemate)
2 = Roommate in same room, but not same bed
3 = Sharing a double bed

Duration of sleep
0 = more than 7 hours
1 = 6 to 7 hours
2 = 5 to 6 hours
3 = less than 5 hours

Good or poor
0 = Good sleep quality (Total PSQI score < 5)
1 = Poor sleep quality (Total PSQI score > 5)

final outcome_dependant
0 = Poor Sleep Quality (more than 5)
1 = Good Sleep Quality (0-5)