I've always been one to get leg cramps, and have gotten them sporadically since my early teenage years. However, when I was going through my first really major Crohn's flare up (before I knew that's what I was going through), my leg cramps were horrid...it would happen every night and be so painful that sometimes I would cry. Also, they would take awhile to work out...I'd have to walk and stretch for quite awhile before they'd feel better and I could go back to sleep, sometimes only to have them re-spasm when I laid back down.
I will agree that the cramps probably weren't caused by Crohn's per se, but Crohn's can cause dehydration and vitamin malabsorption, and those things can lead to leg cramps. Upping my calcium intake before bed seemed to help me some, but it wasn't until my disease was under control that they really got better.
Best of luck to you in handling those nasty cramps!
24 year-old female, Dx in 7/2005 with CD and Crohn's colitis
Rx: Asacol 4.8 gms/day (12 tablets!), Imuran 100 mg/day, Canasa suppositories
Pregnant with Baby #1!