Chronotype is an attribute of human beings, reflecting at what time of the day their physical functions (hormone level, body temperature, cognitive faculties, eating and sleeping) are active, change or reach a certain level. This phenomenon is commonly reduced to sleeping habits only, referring to people as "larks" and "owls" which refer to, respectively, morning people (those who wake up early and are most alert in the first part of the day) and evening people (those who are most alert in the late evening hours and prefer to go to bed late).
Olov Östberg modified Öquist's questionnaire and in 1976, together with J.A. (Jim) Horne, he published the 19-item Morningness-eveningness questionnaire, MEQ, which still is used and referred to in virtually all research on this topic.
Here's the test:
Description was cut 'n' pasted from wikipedia: