Yes, the winter is the time to retreat.This is living with the nature in daoist way. But not only in the daoist philosophy the western people had done the same. To cold outside on the fields nothing to do. Staying home and preparing the working tools for the coming spring when the field work will start again.
Time to have rest to talk and exchange more as usual with family members and reading books as well go earlier to bed. This is like it should be in winter time. Today the most people make no different between the seasons because no need they thinking. Working as much sleeping same hours like usual. They gonna miss a period of energy charging who is needed for body, energy (Qi) and mind. One reason for the spring tiredness. The human did not get the needed rest in winter. Drinking tea, reading book with a candle light many dreaming of it but the most do not bring in to action. I hope you are not one of these people and wish a recreative winter time. Stay relaxed and happy….