How Do The Holidays Affect PPC Advertising?

For those using PPC in the U.S., are you running your campaigns during Xmas Eve, Xmas, New Year’s Eve, and New Years Day?
I don’t have any experience with this but it would seem that although no one is at work, many of these people would be with family or doing something other than surfing the web during these days.
Am I wrong about this? Is PPC just as effective or more so on these holidays? Are you people still running your campaigns during these times?

See original post by Shadowplay