Reveille Has Its Fans, But for Late Risers 9-to-5 Days Are a Pain.

Focuses on the different work schedules of employees in the same workplace. Morning routine of Margaret Wong, an immigration lawyer from Shaker Heights (Ohio), who gets into work at 6 a.m. while several colleagues don't get in until 8 or 9 a.m.; Stigma associated with the individuals who come in later; Technological factors making traditional work hours less relevant; Comments from Timothy Monk, director of the Human Chronobiology Research Program at the University of Pittsburgh, regarding the biological clocks of individuals; Time of day when its hardest to fall asleep, according to Thomas Weir, a research psychiatrist at the National Institute of Mental Health, who has studied sleep cycles; Discussion of human circadian rhythms; Impact of the invention of the lightbulb on work and sleep patterns.