Anyone else feel slightly sad that the holidays are over?

I’ve always enjoyed spending the holidays with family and friends, even more so since I had grandkids. But until this year, I was always happy to see them end, put all the spending and shopping pressure behind me. But today, as we were taking the tree and decorations down and boxing them up, I became slightly bummed out that it was all over. Is that normal on occasion or am I becoming a sentimental old fool? Or worse?