I actually really hate it when I'm dreaming and start to wake up.
They think dreams are the inner brain processing the day's events, storing what is important as memory and discarding that which isn't to save space, like a super functional computer. But as it does this, sometimes there are electrical "leaks" that permeate to the prefrontal cortex and your conscious brain is going "holy forget why are we thinking about bears and disneyland and rollercoasters and outerspace?" So, trying to rationalize that hodgepodge of forgetery going on, you suddenly think you're in an outer-space disneyland riding a rollercoaster with a bear.
Also, I think mawty's comic has nudity.. but it's Jerry Seinfeld's tit, and for some reason moobs as legal but tits aren't.