Pyjama day

Today is pyjama day. When I was living in the USA there was a day at school, in which students were supposed to wear their pyjamas. I never understood the reason and thought it was rather silly. However I´ve recently learned that we are also commemorating this day in Portugal and that it symbolizes the children who have no family and therefore no one to comfort them. While I still find wearing a pyjama outside the bedroom odd, I recognize the importance of remembering those less fortunate than us.