In Japan, most homes lack central heating, and are very thinly insulated, so most people rely on electric space heaters. The most common form is the kotatsu ("heater table") which consists of a low table with an electric heater built into its underside, with a very thick quilted drape around it. People wanting to stay warm seat themselves on the floor under the table. The drape keeps the heat trapped underneath, and it travels through the inside of clothing to heat the sitters' bodies. If they're so inclined, they can scoot almost all the way under the table and use it as a makeshift heated bed, although there is a belief that falling asleep under the kotatsu makes you vulnerable to catching a cold.