you guys are all lucky
i have a permenant triple eye-lid on ONE eye and double on the other, if i slept for too much or as other lyks said about drinking too much water before sleeping, then i will have quadruple eyelids for the first hour... very very depressing sometimes.. =P
I think u can try those 'eyetape' or 'eyeglue' things~~ if u use it a lot, sometimes ur single eyelid will turn to double eyelide permanently (Read in the news...couple of stars/singer tried this solution)
But the downside, it will make ur eyelid saggy/loose if use too much