Since it's a 10 hour flight, do they include pajamas, for example? Also, while I'm at it, if they don't, and a passenger wants to change into sleepwear, are the flight attendants willing/helpful about hanging up the street clothes during the sleeping portion of the flight?

We're going to BA on Christmas Eve, of all things, and returning some time after New Year's. I'm asking because I'm gonna want to be thoroughly rested when arriving Christmas morning so I can put in a full day of festivities.

Rita