RT Journal Article SR Electronic T1 Sleep, performance and the European Working Time Directive JF Clinical Medicine JO Clin Med FD Royal College of Physicians SP 95 OP 96 DO 10.7861/clinmedicine.5-2-95 VO 5 IS 2 A1 Neil J Douglas YR 2005 UL http://www.rcpjournals.org/content/5/2/95.abstract AB