There is no particularly good treatment to deal with this situation, moderate increase in exercise, soaking the entire calf with water higher than body temperature will help some, but this is indeed a relatively slow process. Wearing socks or sleeping in an extra pair of pants will also help some, helping to keep their legs warm enough.
The reason Leg warmers work in situations like this is because they can replace both socks and pants, yes, at the same time. High quality leg warmers are long enough that they can cover both to the ankle to the thigh. These leg warmers are extremely stretchy and after trying these leg warmers, you will never sleep in socks and pants again because these leg warmers are so relaxed and comfortable, they don't cling to your waist and stomach like pants and they don't bind your ankles like socks, they just naturally stay on your legs, free and relaxed.
You can certainly walk around the house in leg warmers as well. They are very warm and also are also not too hot. Wearing them feels like you're not wearing clothes, yet they are warm. If you want to sit on the couch and watch TV or read, the combination of leg warmers plus a blanket is far more comfortable than pants and socks. You can certainly wear them out and about. If the outdoor temperature is cold, then you can pair these leg warmers with your pants and boots and they will definitely provide extra warmth for your thighs, even in windy and snowy weather.
The high quality leg warmers are very well balanced. They are very restrained in their elasticity, which makes them almost unbinding. At the same time, they have elastic bands at the top and bottom, which help these leg warmers to stay on your legs and not slip even if you walk around, they stay stable all the time.
When you want to sleep in socks or pants to keep your legs warm, high quality leg warmers will be more effective and comfortable than the pants + socks combination.