Do not soap as often.
There is nothing therapeutic about soap. We in America are the great overwashed, overdeodorized society, and we as dermatologists see more problems from the overuse of soap than we ever do from the lack of it. If it is not dirty, do not wash it.

Let a humidifier help.
Part of the problem kin ans itching is dry hea in the wintertime. Furnace-heated air can reduce the humidity level inside your house to 10 percent or less, whereas 30 to 40 pecent is closer to ideal for keeping moisture in your skin. For that reason experts recommend the use of humidifiers during those dry winter months- but with caution.
People think that if they put a humidifier in their place, that will take care of it. But humidifiers are like air conditioners, you would really need a huge unit to do the whole house However if put a smaller unit next to your bed, that can help. If you put a humidifier in your bedroom, then be sure you close the door to keep moisture in. Does it help to do things like leaving the bathroom door open when take a shower? It might help for a little while, because every little bit of humidity helps. When you are running that furnace in the winter, you are really sucking the moisture out of the air.

Keep it cool
One good way to combat winter itch is as easy as reaching for your thermostat and turning it down. Keeping your house on the cool side in the winter might help. That is because cool air has an anesthetic effect. It makes your skin feel good. When you heat your house too much, it makes blood vessels dilate and when blood vessels dilate the itch/tingle cycle begins, but when you cool skin either by cool water or cool air, it feels good. And skin tends to be less itchy if you keep it on the cool side.