I have asked they said nothing has happened.
There were no kids there From his room during the week between Christmas and new years.

When mum arrived to collect him he was sitting at a table with an older boy playing and apparently had been playing with him all day.

I don't know if this has anything to do with it either but they said he wakes from his day nap after about 30 minutes and is usually distressed. He doesn't do this at home.