Remember to "SEE"
No, I don't mean for you to schedule an appointment with an ophthalmologist. SEE stands for Sleeping regularly, Eating well, and Exercising. Without these three basics, you can forget about an enjoyable (or even tolerable) holiday. Get your seven to nine hours of sleep and practice good sleep hygiene: go to bed at the same time every night, and wake up in the same nightgown with the same man at the same time in the same house every morning.
Eating well and exercise are codependent, at least in my body, because my biggest motivator for exercising is the reduction in guilt I feel about splurging on dessert. Large quantities of sugar or high fructose corn syrup can poison your brain. If you know your weak spot--the end of the table where Aunt Judy places her homemade hazelnut holiday balls--then swim, walk, or jog ten extra minutes to compensate for your well-deserved treat. Another acronym to remember during the holidays is HALT: don't get too Hungry, Angry, Lonely, or Tired.