Ay naku alam ko yan, ganyan talaga ang leg cramps sa pregnancy especially pag approaching third trimester ka na, one of my friends had it sobrang bad she couldn't walk the next morning! Try stretching your legs before bed, drink lots of water kasi dehydration talaga ang culprit, at siguro din pressure ng baby sa nerves mo na causing the pain. When you can catch your OB later, definitely mention it para ma-check if may vitamin deficiency or something, pero for now try to keep your legs elevated when you're resting and do light stretches, hopefully makatulong na para matulog ka nang maayos tonight, mamsh.