anyone else have sleeping problems and stomach cramps at night?

I'm 31 weeks and I cannot get more that 3 or 4 hours in a row. Even if I don't have to pee I get woken up by vivid dreams and stomach cramps. The cramps are very very mild but uncomfortable. They give me bad dreams a lot. The strangest pretty is I wake up feeling great. I usually put on some star trek though and fall right back asleep. its annoying though because I know these are my last chances to sleep in for a while and I can't do it! Anyone else having this?