Directions: This Scale is designed to help you identify your chronotype, that is, your tendency toward a morning ("lark"), mid-range or evening ("owl") circadian rhythm pattern. To complete this Scale, read each question and consider all of the responses carefully. Then, check your answer for each of the six items on this Scale as accurately as you can. When completed, click on the "Results" button and your score will calculated.

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1.During your last vacation week, how often did you get up later than planned or have difficulty getting ready on time even though you went to bed at your regular time?

A. It never happened
B. It happened once
C. It happened two or three times
D. It happened more than three times

2. When you have no commitments the next day, at what time do you go to bed compared with your usual time?

A. Seldom or never later
B. Not more than one hour later
C. Between one and two hours later
D. More than two hours later

3. Suppose that you have decided to exercise twice a week with a friend. The only time your friend can make it is from 7:00 a.m. to 8:00 a.m., twice a week. Assume you decide to go at these times. Taking into account how you usually feel in the morning, how would you do?

A. Very well
B. Well
C. Poorly
D. Very poorly

4. At what time in the evening do you usually start feeling tired and in need of sleep?

A. 8:00 p.m. - 9:30 p.m.
B. 9:31 p.m. - 10:45 p.m.
C. 10:46 p.m. - 12:30 a.m.
D. 12:31 a.m.- 1:45 a.m.
E. 1:46 a.m. - 3:00 a.m.

5. Suppose that you were able to choose your own working hours. Assume that your job was interesting and paid according to results. Which one of the following 3-hour blocks would be your most preferred work time?

A. 4:00 a.m. - 7:00 a.m.
B. 7:00 a.m. - 10:00 a.m.
C. 11:00 a.m. - 2:00 p.m.
D. 4:00 p.m. - 7:00 p.m.
E. 9:00 p.m. - 12:00 Midnight

6. One sometimes hears about "feeling best in the morning" or "feeling best in the evening" types of people. Which do you consider yourself?

A. Definitely a "morning" type
B. More a "morning" than an "evening" type
C. More an "evening" than a "morning" type
D. Definitely an "evening" type

 
 
You got a score of

17 to 19 = Extreme Owl
20 to 23 = Moderate Owl
24 to 29 = Mild Owl
30
= Neither Owl nor Lark
31 to 36 = Mild Lark
37 to 40 = Moderate Lark
41 to 43 = Extreme Lark

Adapted from: Horne, J.A. and Ostberg, O. "A Self-Assessment Questionnaire to Determine Morningness-Eveningness in Human Circadian Rhythms", 1976.