Lots of bugs and rodents like water. Cockroaches seek out standing water, along with warmth, darkness and spoiling food [source: Benda]. Silverfish, which look like hairy centipedes, are especially attracted to moisture in rooms that are 70 to 80 degrees Fahrenheit (21.1 to 26.7 degrees Celsius). Generally nocturnal, these bugs sometimes come out in the daytime. Flies and gnats are also moisture-seekers, and tend to hover around pipes with condensation -- like those in a dorm sink or toilet [source: No Pests]. And mice and rats are always seeking food, water and shelter. Rodents are especially likely to try and find a way into your dorm when Mother Nature gets feisty and starts dishing up natural disasters like droughts, fires or floods. You really don't want mice in your room; a single pair can create more than 15,000 descendants in just 12 months So mop up any spilled water, take care of leaky faucets, insulate pipes that accumulate condensation and empty any pet water dishes every night [source: PR Newswire].