Well, none of us are perfect....Fortunately, there wasn't patient harm involved in a simple oversight. One thing I'd like to suggest is that you never allow yourself to work more than 12 hours in a day. The last time I worked more than 12 hours, I, too, made a mistake which was a simple, embarrassing, but fortunately non-harmful, error. Subseqeuntly, I don't do that anymore. A more devestating result of overwork can be exemplified in http://drl.wi.gov/dept/decisions/docs/20061214Thao.htm . Now, move on and put this behind you.