This idea popped up on Facebook just before Halloween. Apparently it originated on news sharing site Reddit. It spread all over as expected. Buzzfeed's 12 Absolutely Terrifying Two Sentence Horror stories for example.
I wanted to wait till I could think up one myself, combining two things I find scary: spiders and dreams before posting here. I'm certain my aversion to spiders has more than just their scary legs, drops from the ceiling, and the likelihood that they walk across my eyelids at night to blame. Nope I saw the film The Incredible Shrinking Man when I was very young on a large screen and sheet that spider was nightmarish.
I don't know about you, but my dreams can be pretty scary and thank heavens I usually wake up mid- scarefest. Good Lord, where does that stuff come from? The obvious answer is you dream scary things when creatures walk across your face while you sleep. Pleasant dreams!
DOA's Two Sentence Horror Story (A complete tale in two sentences)
Dreaming, dreaming, softly weaving, in a cocoon of infinitely silky fibers, safe, safe.
Awakened, forsaken, spun into the web of a dire spidery beast, pincers moving my way.