My 4 years old first stay over.

Time really fly, it seems like yesterday I just have my baby. However, yesterday we sent our 4 years old off to my girlfriend home for his first every stay over night with friend.
Our home is unusually quiet with him. He is a talker, he talks and talks until he goes to sleep.
We wonder how our friend handle with him and her other 4 little ones. We called the first thing in the morning, she said they survive and he is a good boy. I thought hmmm...good boy at other people but a handful for mama and papa, sigh :). I suppose kids are like that :).