Cramps at week 37 especially throughout the night

Anyone experienced bad cramps at week 37? Mine happens mostly at night and I couldn't sleep at all due to the bad cramps. Its a combination of tightening of the tummy and lasted for an hour plus. I could manage to only sleep for an hour before awaken by cramps again and couldn't go back to sleep as the cramps is there for another hour or so. Also, it accompanied with tummyache which I went (not constipation and not diarrhea). No bleeding, water bag didn't burst. Last week went to gynae and was told that I am not dilated yet.