Hot flashes or wtf?

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The last few nights I've been really hot. I'll wake myself up trying to kick the covers off and I'll be really nausous. Last night was the worst though. Was up for half an hour at 2:30 trying to cool off. I'm usually freezing but not so much anymore. I know body temperature rises in pregnancy but what about when you get super hot only at night? Is that normal and any ideas of how to cool off some?