Keeping the sun inside of you, when you are missing it on the outside, is a way to say hello to the sun and let it warm your soul.
One way to do this is to find a warm spot in our house where we can sit or lie down in peace. Closing our eyes, we allow our breath to come and go easily, progressively lengthening each inhale and exhale until we feel very relaxed, peaceful, and warm. We imagine that it is a very warm summer day and that the sun is shining on us, allowing it to warm our body. In particular, we may feel as if a small sun has taken up residence in the area of our solar plexus or our heart. We do not need to think about which one too much and can simply trust our body to let us know where it is. Spend some time just experiencing this sensation, allowing the heat to radiate from inside your body.
If you live in a part of the world that loses a lot of light in the winter, you might want to do this exercise each night before retiring. You could also do it at the beginning of each day, giving yourself a chance to plug into that great source of energy. Keeping the sun inside of you when you are missing it on the outside is a way to say hello to the sun and let it warm your soul.