Did you know that SAD can be eased by a number of different activities including productive learning? Here's more info on the condition: Winter SAD info
A a great example of productive learning is The Essential Life Plan / Life Skills Program
There are three main activities. The first involves identifying your core values. Most say its fun to do and the time tends to fly by while you do it.
A little effort here can really help you to both feel better and help you to begin to plan a better, happier life!