If you’re on a budget and don’t want to buy magic dust, raid your kitchen. Mix equal parts baking soda and salt. Sprinkle that blend all over the furniture. The baking soda creates a pH imbalance that messes with flea larvae, while the salt acts like tiny moisture-sucking sponges.
Leave it for 24 hours, then vacuum it up. Your couch will smell like a potato chip from the salt, but it’s a small price to pay for freedom from the bitey bastards.