Here ya go:
“When fructose is consumed in the form of sucrose, it is digested (broken down) and then absorbed as free fructose. As sucrose comes into contact with the membrane of the small intestine, the enzyme sucrase catalyzes the cleavage of sucrose to yield one glucose unit and one fructose unit, which are then each absorbed.”
http://en.wikipedia.org/wiki/Fructose
if you have any interest, pick up a biochemistry text, truly amazing to understand some of the chemistry of our bodies.
here's an interesting biochem tip- if you happen to drink a wee bit much, drink something with a lot of glucose (or sucrose) before going to bed. For the extra credit, why?