Many people believe that Christmas is only on December 25th, however Christmas really lasts for 12 days (just like the song) starting on December 25th and ending the day before Epiphany.
That means that Christmas isn't over yet because today is the last day of Christmas.
Unless your dried out Christmas tree is a fire hazard, try to keep all of your Christmas decorations up through today and keep your Christmas lights still lit.
Before you take down your decorations tomorrow, you should consider a new Christmas decorating trend that might make you think twice about removing all of your decorations.