A fast way to increase humidity without turning the bedding into a sopping wet mess is to buy a package of new synthetic sponges, get them wet, and stand them up in a wide but shallow plastic container that you then put in the enclosure. The idea is to get lots of air flow over/around the surface area of the sponges, and the container ensures that you don't end up with the water all over the floor of the enclosure. Then instead of spraying you just add a little water to the plastic container and the sponges will soak it up and allow it to evaporate.