I have too smacked my husband awake to get rid of a cramp. I have had agonising cramps and just dull ache in legs all night for the last trimester. Like Tinsel once I started taking Rennie for heart burn they got a bit better. If i feel one coming now I just stretch my leg as far as it will go and stick my finger in where the cramp is coming and it seems to go before it really takes hold. Good Luck. I have also heard having a banana for potassium but unfortunately cannot stomach bananas so have not tried that.