This has happened multiple times; probably due to the birthday celebrations (if I were that old and had that many pretty girls around me, I probably would collapse to!)
Interesting you say that I did an FR search..and he did the exact same thing last year after his birthday party! Same exact date..
Trent Lott needs to cut out the partying in the Leaders office, or find Hillary's staff to greet him happy b-day (on second thought that might not be such a good idea)