SAN DIEGO—A study conducted at the University of San Diego found that during an average night's sleep, at least 14 different animals, ranging from ants to Gila monsters to wounded possums, are likely to scurry, slither, or crawl across a slumbering individual's body. "You become a virtual playground for these creatures mere minutes after you fall asleep, inhaling dozens of insects and swallowing up to 17 spiders during an eight-hour period," lead researcher Jack Paulette told reporters Thursday, adding that earwig colonies spend each night hatching thousands of their young in and around human genitalia. "If you’re lying in bed and feel as if something has just brushed across your leg, that's because something actually has. In most cases, snakes." Paulette added that it's not uncommon for a baby mountain goat to clamber upon one's shoulder at night in an attempt to find purchase, and that people who awaken with mountain-goat afterbirth in their bedsheets should know they aren't alone.