The answer is yes. Hardwood floors have gaps and cracks where fleas can hide. The junction between the hardwood floor and the wall is where fleas often hide on hardwood floors. The fleas don't eat the hardwood floor while they're hiding. Fleas are waiting for a host, such as your pet, to latch onto. As fleas can survive on hardwood floors, they will easily migrate to soft floor coverings such as carpets and rugs.  Because fleas are able to jump, they can move from the floor onto your couch.