When Smokey Robinson sang, "Now they're some sad things known to man/But ain't too much sadder than/The tears of a clown when there's no one around."

That's pretty sad stuff.

Another kind of sadness is seasonal affective disorder (SAD), a specific type of depression that's (almost always) linked to sun-shortened winter days. But because it's seasonal, a lot of people just accept the SADness and muddle through until April.

Ten million Americans have full-blown SAD (about 10% of folks in New Hampshire and 1.4% in Florida), and it affects women four times more often than men.

Why does this happen? Less sunlight means your brain produces less of the feel-good hormone serotonin and more of the sleep hormone melatonin.

The result? Grumpiness, lethargy, overeating comfort foods, and disinterest in engaging in your life. The answer: more light.

Light therapy treatment has proven effective in reducing appetite and food cravings, as well as elevating mood and improving sleep patterns. And it's as effective as antidepressant medications.

Work with your doctor to get good-quality light therapy using a light box that provides 10,000 Lux exposure and filters out most or all UV light.

Every morning, position yourself in front of the box (don't stare) or put it off to the side. Sit 16 to 24 inches away. Open a book and read for 30 minutes.

In addition, make an effort to exercise regularly and socialize. That combination should boost your mood.