The scenario in which students sleep in their bedrooms from 2: 00 a. m. to 9: 00 a. m., rush to a 9: 30 a. m. class at the university, grab a quick lunch at the cafeteria, nap on the grass at about 3: 30 p. m., return to class at 4: 00 p. m., collapse in bed at 6: 30 p. m., study in a library study room from 8: 00 p. m. to 10: 00 p. m., and go to a club from 10: 15 p. m. to 1: 30 a. m. illustrates the sociological concept of