The gut has a nocturnal cleaning process that propels contents through the intestines during sleep.

“it can also during night while you're sleeping a cleaning process goes through the gut in which a wave begins at the stomach goes down the small intestine down the large intestine and cleans the gut out open sphincters so the things that would ordinarily be much too big to pass can go through so a little kid can swallow a paper clip a dime sometimes an open pin and all those things are passed and miraculously i don't know how the gut manages it but if an open safety pin goes in somehow it manages to propel it always down with the small end down and it almost never gets stuck”