“People think the holidays are supposed to be the happiest time of the year, but for many of us, it’s stressapalooza,” says Dean Sluyter, who has taught meditation for more than 40 years and is author of Natural Meditation: A Guide to Effortless Meditative Practice. The good news: Meditation can make it easier to reclaim your jolly — and you don’t have to sit in a dark room waiting for your thoughts to clear. If…