Its hard to say, I've had the nausea & some vomitting at nights now it feels like having morning sickness all over again. Most things I read say that it can happen & not to worry too much. If you have been having labour type pains it very well could be your body preparing for everything. Last night I was up for an hour with tightenings and had to get up & move around to settle it down.

I had pre-labour with Matilda for a while & it was like that. Have you tried using a heat pack or bath to help settle things down? I have found that helps me get to sleep.