RT Journal Article SR Electronic T1 Late daytime naps may cause drowsiness after coronary bypass graft operation in the first postoperative week JF Neurosciences Journal JO Neurosciences (Riyadh) FD Prince Sultan Military Medical City SP 348 OP 350 VO 12 IS 4 A1 Yilmaz, Hikmet A1 Iskesen, Ihsan YR 2007 UL http://nsj.org.sa/content/12/4/348.abstract AB