Someone who is sick with the flu in Chicago and often sleeping on their back on the long couch usually with a backpacker liner with hood enclosed with their face showing or wrapped from shoulders to toe in fleece. The reaction might inspire a few creative nonfiction writers who got the idea from old photos going around. The blanket often used is a full size fleece blanket or something that is not bulky. This would be forced the one who is sick to stay in bed and keep them out of their room mates quarters. This is sometimes borrowed from first aid for when those had gone into shock and get the chills; or hypothermia. This is common in the Chicagoland area; where some would sleep in their friends Chevy Van if has a bed set up but make sure they're secured or a makeshift bed in the back of a older station wagon. Sometimes knocked out while the driver is going around looking for a fix not knowing the person who is under the weather needs an IV.
Way we saw the lady hosting a party in Justice there was some guests under the weather and chugging theraflu like it was Vodka in a mug then coughing up their lungs, one of the guests was Egyptian wrapped and sleeping on the couch. They stuffed the wrapped body in sleeping bag too and placed her on the couch. She was running a high fever and had doctor making a house call. Hence they coined this a Couch Mummy.