For a change, a friend asked me to help cheer him up because of Christmas blues. Just the action of telling him it was only a couple of days and we'd be through it and things would be normal again, helped me get in a better mindset.
After all, Christmas isn't actually the super, ultimate, be-all and end-all of holidays -- it's only our consumer markets trying to tell us that so we'll go insane buying things. It's a holiday. The year isn't over yet.