Congrats on the twins! We have 3 year old twins who are a delight!
The leg cramps: water and potassium DOES help. I encourage women to eat a banana before bed and drink lots of water. Also, if you tend to get the leg cramps at night, try doing 20 pelvic tilts before bed (get on all fours, sag your belly toward the ground, then tuck your tailbone under like a vertical wag until your spine is STRAIGHT (not arched)). This works best if you do it ON the bed, then get right onto your side and go to sleep immediately afterward. This same exercise helps if you find yourself getting up numerous times in the night to go to the bathroom.
"There is a secret in our culture. It is not that labor is painful but tha twomen are strong."