<< Earplugs. >>
Most family members/roommates would cringe at the idea of wearing earplugs when they sleep just so you can play games late at night. Trust me, ikar0s, silent mice and keyboards are extremely useful when the computer is located in or near a bedroom. Unfortunately I don't know which mice are silent but I've heard of some other solutions: mouse pens, joysticks, and some trackballs can do the same thing as a mouse without noise.