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Leaving lights on is not an effective or foolproof method for keeping cockroaches away. While roaches are nocturnal and prefer darkness, light alone is not enough to stop them, especially if they are seeking food, water, or shelter. A bright light might temporarily discourage them, but hungry or determined roaches will often adapt and venture into lit areas. For more effective cockroach control, it is better to focus on proven prevention methods. These include maintaining cleanliness by eliminating food crumbs, sealing cracks and entry points, reducing clutter that provides hiding spots, and fixing any moisture issues. Using traps or repellents can also be part of a comprehensive strategy.

Humans attract fleas with their body heat, the carbon dioxide (CO2) they exhale, body odors, and movement. Fleas love hiding in warm, dark places like hair and scalps, armpits, and groin areas. Fleas prefer to feed on pets and wildlife, but they do bite humans when other warm-blooded mammals aren’t available.

As a general rule, if you hear an animal in your attic, don’t assume it will stay there. Animals are drawn to warmth and food sources, which could lead them to other parts of your house. In particular, it’s likely that small pests such as rats and mice that only need tiny gaps to squeeze through will end up in your walls and ductwork. Larger animals like raccoons may be limited to an enclosed attic.

Spiders are not typically attracted to bedding as a primary source of food or shelter, but they sometimes inadvertently end up there. Spiders can hitch a ride on your clothing, belongings, or through open windows and doors. The underside of a bed, especially if it's near a wall or corner, can provide such a sheltered spot where they can hide and build webs. Dust and clutter under your bed can create ideal hiding places as well. If your room has other insects like flies or mosquitoes, spiders may be drawn to the area in search of prey.