My cats have never hidden under the covers in my bed but I've found Pearl hidden under the recliner cover on the seat part. She'll also hide under the skirt part of it to try to ambush the other cats as they walk by. Sunny used to hide under the skirt of my couch cover. I'd see a big lump and usually it would be him but sometimes it would be Pearl. Pearl also loves to hide in my closet if I let her. Storm was caught on top of my refrigerator one night because my former roommate told me how he scared her. I've also found Storm in the cabinet under the sink in my hall bathroom.