This is the time of year for that, and a more serious condition called "seasonal affective disorder," or SAD.
The drop in sunlight and colder weather bring on seasonal emotional problems for about 15 to 20 per cent of us.
Experts say it is a true depression.
The best way to deal with it is to attack it head on.
Psychologist Mike McKee, Ph.D., says, "You have to get out of bed. You have to get outside. You have to get away from the booze, it makes things worse. You've got to get with other people and you've got to get moving."
A special light that mimics outdoor light can help lessen SAD.
Be on the lookout for signs, such as sadness, anxiety, irritability, withdrawal from social activities, and inability to concentrate.