A study from Circadian Technologies, http://www.circadian.com, a consulting firm which specializes in advising the nation's largest companies on how to manage their extended-hours operations, estimates that maintaining the practice may be costing companies a steep $206 billion annually -- $8,600 per worker.
See story on Business Week web site at:
http://www.businessweek.com/bwdaily/
dnflash/jul2003/nf20030711_4474_db035.htm.