So this happened to my cousin and told me about it. He was super tired after eating pinto beans for dinner that while he was asleep he farted soooo loud that it  woke him up thinking it was an earthquake or something. So he had his eyes wide open and he said well now i wont be able to go back to sleep but the fart smelled so bad like sleeping gas that it made him sleepy. His fart was like sleeping gas his own fart put him back to sleep. So as you can see the same fart woke him up and the smell put him to sleep.