11.   Some shift workers and jet travelers routinely reset their body clocks by sitting in front of bright lights for a time.

12.   Such drugs also would be useful for shift workers and others who must shift their sleep pattern abruptly, he said.

13.   Two Nuernberg plants of Siemens AG, the computer and electrical machinery manufacturer, were the first affected when shift workers did not arrive.

14.   Two Nuremberg plants of Siemens AG, the computer and electrical machinery manufacturer, were the first affected when shift workers stayed away from their jobs.