ADDITIONAL VALIDITY EVIDENCE FOR A MEASURE OF MORNINGNESS

Morningness refers to a preference for morning versus evening activiti es. This study assessed the predictive validity of an instrument devel oped by C. S. Smith, C. Reilly, and K. Midkiff (1989) to measure the m orningness construct. Morningness data were collected from university students (N = 454) at the beginning of a semester to examine the relat ionship between morningness and student behavior (i.e., sleeping, stud ying, and class scheduling) and performance. Results indicate that mor ningness was predictive of patterns of sleeping, studying, and class s cheduling. Morningness also interacted with the time at which classes met to affect performance.