Many plants use this poorly lit season as a resting phase. They stop growth and bring down their metabolism. Indoor plants prefer slightly warmer surroundings, while people usually like to have a very warm indoor temperature. For a lot of plants it is a good idea to place them away from heaters. Additionally if you choose to locate your plant in front of a window, you should make sure it does not get a cold breeze, and that none of its leaves are touching the window. Otherwise the plant will get a thermal shock and its leaves will turn brown and fall off. The root ball of your plant should neither stand on a too cold or too warm floor. Either of these two extremes will result in the plant reacting by losing its leaves. To prevent this, place a piece of styrofoam, a cork tile or a plant dolly under the pot.