* >!In the 'Piggy Tales' episode 'Snooze'. One of the pigs attempts to wake the other up due to his snoring. And uses a variety of loud ways (Such as a train passing by, and blowing up TNT next to him). None of these work, and in exhaustion the first pig falls asleep again. Then the first pig also starts snoring (A quiet sound compared to the others), and this leads to the second pig waking up.!<
* >!In the SpongeBob episode 'The Secret Box', when SpongeBob attempts to steal Patrick's secret box while the latter is sleeping, his movements cause surprisingly loud noises. None waking up Patrick. But only when he whispers to himself how Patrick is a heavy sleeper, he wakes up immediately.!<
* >!in the 'Happy Tree Friends' TV episode 'Easy For You To Sleigh', as Lifty and Shifty are attempting to steal from houses, they enter Flippy's house. With Flippy fast asleep on his chair with a plate of cookies on his lap. As the two thieves start stealing things they accidentally break some things and even accidently turn on the TV. Surprisingly, Flippy does not wake up from any of it. So Lifty and Shifty manage to steal everything from the house. Even tying up Flippy in the process. But when the two decide to take the cookies, a crumb breaks of from one, and lands on the floor, breaking, This ends up waking Flippy up. (Then unfortunately, upon waking up. Flippy realizes he's tied up, gets a PTSD flashback, switches to Fliqpy, and goes after Lifty and Shifty).!<
* >!In Alan Becker's 'Actual Short' 'Mission Impossible', The Color Gang try waking up The Second Coming in different ways. Red plays a loud horn. Blue hits a loud bell. Green Plays an electric guitar loudly. And Yellow places Second Coming on a minecart and has him go through numerous loud things. Nothing wakes up Second Coming and the gang gives up. But upon Red's horn (Which was placed on a chest) falling and hitting the ground, Second Coming wakes up immediately.!<

A character is so asleep that not even the loudest of sounds can wake them up. But upon a quieter sound happening they wake up almost immediately.