Reader Eyes Wide Open has this to say about how she gets through the holidays with her sanity intact:

"Exercise!!! We try not to get stressed at the holidays because this season is such a lovely time and we enjoy the season so much more than the day - it’s hard to enjoy if everything is all stressed. This year has been tough with my husband not working much (and not receiving unemployment); when it all seems too much I cue up my iPod list and sweat it out until my legs are jelly. I usually try a new physical challenge (”I’ll do the big hill by the beach twice today!”) and by the end of the session, I’m so amped on adrenaline and proud of my accomplishment that I have no time to dwell on the stressful things. Plus then I can justify eating all the treats at the holiday parties!"

She's onto something (and she has a blog, too, that you'll enjoy). Experts tell us that it's right at this time of year that many of us experience a dramatic dip in our body's level of serotonin (a neurotransmitter that regulates, among other things, mood and sleep). Low levels of serotonin = disrupted sleep and down moods (or, in some people, actual depression) (remember that women are twice as likely to experience depression as men, and that a number of studies I discuss in my book found that women with stepchildren have higher levels of depression than women without stepkids).

New York City psychiatrist Andrew Gotzis, M.D. confirms that there are three ways to up your serotonin levels without medication:

1. Sleep
2. Exercise
3. (You'll like this one) Orgasm

So those are the ingredients that make for a happier, less stressed mood this holiday season. Easier than sugar cookies, right? I'm trying to keep a straight face here as I say: Have fun.

(For some of us, an additional boost like melatonin at night and 5HTP during the day, or an antidepressant, may be necessary. Ask your doctor — you deserve to feel great)