Day-to -day life requires certain things of us. School/work/whatever. We're too busy to think. Holidays arrive and all you do is think. Why?

You think about happier days. You think about the people who are no longer in your life whether through death or estrangement or others circumstances beyond your control. It is a wistful time...melancholy even sometimes. Do you enjoy all the days of holidays or enjoy it more when they are over? Why?