Here in the tropics we have plenty of insect life. Including spiders. In fact, just this morning as I was hunting for something in one of my boxes (here, I keep everything in covered plastic boxes) something round and tiny scooted out from under it and ran off in a flurry of itty-bitty legs. So when I read a blog post telling how the author thought she had swallowed a spider and that she had recently read we supposedly swallow 4 per year in our sleep, I had an Uh-Oh moment.
Don't you love Google? I ran a search on "swallowing spiders." Whew. Urban legend. Read about it on Snopes.com if you need confirmation. http://www.snopes.com/science/stats/spiders.asp