Robert Ringer in his book "Winning through intimidation" put forward the theory of next.
The idea is simple but can be viewed in two different lights.
One is to always be focused on the next thing because the current thing might not work out.
The other, suggested by just the name of the theory alone, is to always be focused on the next thing.
How does that help with SAD?
If it's a particularly bleak day focus on the next sunny day. Prepare for it. Think about.
If it's fall and you're feeling down, focus next spring. Focus on getting in shape for spring.
If it's the dead of winter and you're sitting in the dark at only 6pm plan a trip. (You don't have to take it.)
Keeping your focus on what's to come can be a lifesaver.
(Remember that this blog is just my random thoughts. None of this is medical advice.)
Just a northern guy battling the winter blues and information about my daily life + thoughts.