We were at a family reunion on a camping ground. we were smimming, then my mom shouted at me to go get grandpa because he was drifting away, ( he was floating on his back) i grabbed him by the arm to bring him back to shore and he was sound asleep, snoring and all. LOL, i made it a point after that to learn to sleep on water... and i do !!! I float so well only a ton of bricks could sink me. First thing i did was teach my kids how to float, even before swimming.