You are not alone if you feel the Holiday slack, it's harder to concentrate... you aren't working as fast and the holidays are distracting you. Many and most Americans do according to recent news. 

Don’t feel much like working today? You are definitely not alone. With Thanksgiving and a four-day weekend just around the corner, it’s hard to keep your mind on the working world.

In fact, one-third of managers say productivity is always down during the week leading up to a major holiday.

The reason most gave is that this time of year is generally less busy, and employees tend to have more things going on outside of work, like family gatherings and parties. (PR Newswire)