I just had the two most amazing cramps this morning, at the moment I woke up and moved legs, (OH came in from work at 6am and slammed the door, so his fault).
And I have been drinking water like a fish lately and no problem with cramps since 16/17 weeks I think.
Last night after getting up twice to wee, I was thirsty again as usual and decide to just have a sip instead of a drink as wanted some sleep, and so this morning I was really thirsty and hey ho - big old cramps!
So I think its lack of water / fluids - just wanted to tell you all