Lots of the plants that spend summer outside come inside for the winter.
Like this orange plant, this time of year it starts to not do so well. Its a natural, thing I was lucky it was still producing these little oranges until now. The leaves are starting to dry out, its not getting enough light, don't worry. When summer comes, these plants will go back outside and within a week or two, they will regrow their leaves, get bigger and do just fine. Don't worry so much about the plants, they'll be fine when winteris over and we get some sunshine.