Moving plants from high to low light will result in either a gradual decline or, in the case of some plants like ficus, sudden leaf drop. It's best to gradually acclimate plants that have summered outside to the indoor environment over a period of a week or two in the fall before bringing them in for winter. Start by bringing plants in for a few hours a day, increasing the time slowly over a 2-week period. Larger plants can be first moved to an outside, shady location with very low light intensity for a couple of weeks and then moved into the house. The air in a house typically has low humidity, especially when the heat is on during cold periods.
Some houseplants benefit from increased humidity.
To achieve this, I often place gravel trays filled with water under the plants, and group plants together to help create a humid environment. Watch the Watering Overwatering kills more plants than all other factors combined. It deprives the roots of oxygen and promotes root rot. Some plants such as African violets, do well in a continually moist, but not wet, growing mix. By placing wicks in the soil, they can draw water up from a reservoir underneath the plant to provide a gradual, constant water supply and eliminate the need for frequent watering.