Try to get sunlight exposure during the daytime. Doing regular physical exercise for 15-30 minutes may help in getting good sleep at night.
Avoid sleeping in the daytime, and engage yourself in other day-to-day activities. Maintain the room temperature, the bedroom should not be too warm or too cold.
You can use humidifiers to avoid dry winter air inside your rooms. Avoid overeating, especially during dinner time in winter.