Keep in mind that our heating systems dry out the air inside our homes. That means even though you aren't sweating, you still need fluids. The right balance of fluids helps keep our energy level stable.
If you are like me, you just want to sleep a little longer when it's dark and dreary day. It's okay to take more naps, and sleep a little later when you have time. It's natural. And it can help you feel more rested and less stressed out. Sleep is a natural healer. Keep in mind, you should go overboard. Sleeping twelve hours every day is probably a little too much.
Photographers are always talking about natural light. The natural sunshine is best for lighting. In life sunshine can help you beat the blues. It doesn't matter if it is summer or winter, I always feel more energetic on bright sunny days. But the truth is just daylight of any kind can make you feel a little better in the winter. And direct contact with that light is the best.
I was surprised when I visited the doctor recently, and he informed me that he likes to add a vitamin d test to all of his lab tests. He stated that it is a key factor in SAD (seasonal affective disorder). He stated that it is one of the easiest ways to treat a lot of illnesses that is often overlooked. Here's a side note many insurance companies don't pay for the addition of this to lab work. The right levels of vitamin d in your body really does help combat the winter blues. It's cheap. It's easy. And science shows that it works.
The movement is great for you. And if you can move around outdoors, you have killed two birds with one stone. Walk during lunch breaks, or earlier in the day if possible.