Television: Life Begins at 3:45 A.M.

For David Hartman, as for all those bleary-eyed stars of the morning, last Tuesday may be taken as a typical day. He gets up at 3:45 a.m., showers, dresses and drinks a pint of orange juice. At 4:30 an ABC limousine picks him up for the 30-minute ride from his home in suburban Westchester County to the Good Morning America studio on Manhattan's West 66th Street. Since seconds are precious at that dark hour, Hartman uses the 30 minutes to munch an apple and a banana and read—or "zap through," as he says—the...