As random as the first dream was, I can pinpoint the influences on it.
I went to the opening of Halloween Horror Nights where one of the "scare zones" had a bunch of female vampires. (It figures that the area I spent the least amount of time in would work its way into my dreams.) And the jellyfish comes from the magazine that I was reading on the plane.
I purchased a National Geographic on predatory animals and they had a weird section of several pages focusing on jellyfish.