He could sleep

in the air without falling, by merely lying on
his back and floating, but this was, partly at least, because he
was so light that if you got behind him and blew he went faster.

"Do be more polite to him," Wendy whispered to John, when they
were playing "Follow my Leader."

"Then tell him to stop showing off," said John.

When playing Follow my Leader, Peter would fly close to the
water and touch each shark's tail in passing, just as in the
street you may run your finger along an iron railing. They
could not follow him in this with much success, so perhaps it was
rather like showing off, especially as he kept looking behind to
see how many tails they missed.