Elevation acclimatization is definitely an individual issue. Get plenty of rest, stay hydrated and sleep lower than the highest elevation you hiked that day. If you are really concerned they do make a drug that is supposed to help. You would have to talk to your doctor.

Here is the technique we have used in the past... though definitely not a recommended technique:
http://www.backpacking.net/forum/ubbthre...7783#Post167783