Grandpa: Ehhh, welcome to my world.
Death is usually compared to sleep. We have a Deep Sleep and the Big Sleep, but there's also those times when a character has Passed In Their Sleep. This, of course, occurs when a character dies of a natural cause such as a disease, old age, or of an injury. And many people argue that this might be the best way to go.
Oftentimes this kind of death is portrayed for mystery (death in your sleep, while natural, has no directly visible causes) or exoticness/symbolism (a form of Peaceful in Death).
Compare Big Sleep, which is when a character's eyes close as they die, making it look as though they were sleeping, and Peaceful in Death, which is when a person is content with their death, whereas Passed In Their Sleep just refers to a character who passes while they sleep regardless of whether they thought they were ready. Also compare Slain in Their Sleep, where a character is murdered in their sleep and it's portrayed as tragic rather than peaceful.
As a death trope, all spoilers will be left unmarked!
- Grave of the Fireflies: Setsuko dies of starvation and sickness while she sleeps.
Seita (In a voiceover): She never woke up.
- This is revealed to be what happened to Nausicaä's father after she finds the Tolmekian soldiers in his room and him dead in Nausicaä of the Valley of the Wind.
- Near the end of Persona -trinity soul-, Ryo Kanzato passes away like this after he uses his Persona powers to help his siblings defeat the Marebito and save Ayanagi City from another Apathy Syndrome disaster.
- In the Tenchi Muyo! OVA series, Tenchi's mother Kiyone died like this while a young Tenchi was sleeping next to her.
- How Future Goku is depicted to have died to the heart virus in Dragon Ball Z: The History of Trunks. He dies in his bed and was most likely comatose given how main timeline Goku remained in a coma while he was ill.
- One of Subaru's many deaths from Re:Zero, involved him simply going to bed as usual and to wake up the following day only to realize that Return By Death had activated making it clear that he somehow ended up dying during his sleep.
- In Thorgal, a girl escapes from a hidden valley inside a glacier, where "time was frozen". She goes to sleep and ages to death before she can wake up.
- In the "Mobius: 25 Years Later" comic arc in Sonic the Hedgehog, Knuckles mentions that this trope is how his father, Locke, died, while he was admitted to hospital.
- In the fanfic Mort Takes A Holiday, this is how Granny Smith's husband died.
- In Gensokyo 20XXV, we have this with Satori, who dies during the night when after spending the entire day enjoying herself since her sister, Koishi's, death.
- An Unsung Song: Gamemaker Misty dies of a heart attack in her sleep.
- Sleepless: In contrast to other deaths in the fic, Vinyl passes away quietly: she dies off-screen, never waking up from the coma.
- In the film The Elephant Man, the title character has a large tumor on his face that greatly disfigured his face and causes him to be mistreated by the public. When he finally tries to go to sleep like a normal person (laying down instead of upright) he ends up dislocating his neck as he sleeps and dying. It's impossible to say for certain, but many people suspect his death was a suicide.
- Defied in Return of the Jedi. Yoda heads to bed to try to avoid Luke's questions, then fights to stay awake to give him some last words of advice before (literally) fading off mid-sentence.
- In the film Titanic (1997), Rose may have passed away peacefully in her sleep at the end (it's purposefully left ambiguous).
- Parodied in Scary Movie 3 where C.J. and Mahalik discuss the trope and end up arguing if one can actually "wake up dead".
- Interstellar: The novelization of the film shows that Edmunds settled into hypersleep to await NASA response after confirming that the planet was in inhabitable; while he was asleep a rockslide destroyed his shelter, giving him what's most likely the most painless death of all the scientists.
- Captain America: Civil War: While the Avengers are discussing the Sokovia Accords, Steve gets a text which says, "She's gone. In her sleep." The next scene is him at the funeral for Peggy Carter.
- The Prince of Egypt shows the final plague this way; since it happens in the middle of the night, the firstborns of every Egyptian family die in their sleep. ... All except for Rameses' son, who was awake.
- Due to being so morbidly obese, Bonnie dies like this at the end of What's Eating Gilbert Grape, after climbing the stairs to sleep in her bedroom.
- "When I die, I want to die like my grandfather who died peacefully in his sleep. Not screaming like all the passengers in his car."
- In the Harry Potter Verse, school legend has it that elderly Professor Binns died while napping in the teachers' lounge. He then got up to teach his next class as a ghost, and it's entirely possible he hasn't actually noticed he's died. Presumably the rest of the faculty were unable to think of a tactful way to broach the subject.
- The Kane Chronicles: In The Red Pyramid, Sadie has a conversation with Iskander, the kindly, two-thousand-year-old head of the House of Life, in which he seems to be on her and Carter's side, but the next morning they discover Iskander died in his sleep, which means their lives are now in danger, as his replacement immediately orders their arrest and execution.
- This is how Tunstall dies in the third Provost's Dog book. After a long and arduous battle in the cold and rain, Beka can't make herself kill him and ties him up for proper capture instead, even while thinking this is a Cruel Mercy. When she goes to give him some food the next day, she can't wake him and finds his body locked in rigor mortis—cold and shock did him in overnight.
- In The City of Ember, this is how Lina and Poppy's grandmother dies. After she starts succumbing to an unknown illness, she tells Lina to go to sleep, and the next morning, Lina finds her body still in bed.
- In Fool's Errand, Nighteyes gets this. After being tortured and run to exhaustion, Nighteyes and Fitzchivalry sleep in the cave. Nighteyes gets up to go hunting and when Fitzchivalry tries to follow. Fitzchivalry wakes up just in time to hear Nighteyes breathe his last in his sleep.
- A Song of Ice and Fire: Ser Harlan Grandison died peacefully while sleeping in his cell in the White Tower.
- Discworld: This how Granny Weatherwax dies in The Shepherd's Crown, despite the prologue and first chapter implying she'd die in the coming battle with the elves.
- Archie Bunker's Place: The tearjerker episode "Archie Alone," which explained Edith's death due to a stroke suffered in her sleep. When Archie finally lets go of his emotions, he bemoans being unable to figure out why she was unresponsive as he shook her repeatedly, hoping to wake her up so she could fix breakfast.
- Full House: Played straight in the Season 7 episode "The Last Dance." Jesse's grandfather, whom also becomes very close to Michelle, dies in his sleep while staying at the Tanners.
- Used in The Twilight Zone episode "Perchance to Dream". A man thinks that if he falls asleep he'll die. At the start of the episode he goes to a doctor's office, lies down and closes his eyes for a moment, then jumps up and explains his situation to the doctor. At the end it's revealed that it was all a Dying Dream; the doctor reports to his nurse that the man came into his office, lay down, and never woke up.
- On an episode of Red Dwarf, Rimmer found a letter saying that his father (who of course died thousands of years ago) died peacefully in his jeep...er...sleep.
- All in the Family: "The Saga Of Cousin Oscar". At least Cousin Oscar went peacefully, without barking orders at Archie, Mike and the others.
- Pompeii: The Last Day: The last we see of them, they have all fallen asleep from exhaustion and are spared the suffering that others went through during the remainder of the disaster.
- The Big Bang Theory: Debbie Wolowitz dies at Howard's Aunt Gladys while she was sleeping.
- Kenny Rogers: In "The Gambler," the titular character informs the narrator that the best a gambler can hope for is to die in his sleep before slipping away himself.
- The Daniel Amos album Songs of the Heart ends with "My Hand to God", in which the elderly Bud Akendorf dies in his sleep. In this case, the song is from Bud's perspective as "The Mysterious Stranger" comes to ferry his soul away. The lyrics emphasize how peaceful the transition is:
Never seen the moon so big and brightor had a dream this strangely soothing.
- Task Force Games' Central Casting: Dungeons generic RPG supplement. In the sample dungeon "The Gambling Pit'', the dungeon was originally abandoned because of poison gas that entered the air supply quickly and without warning. Most of the dungeon occupants who were awake at the time managed to escape, but almost all who were sleeping at the time died (apparently the occupants who were awake were too busy fleeing to wake up the sleeping people).
- While most of the Franchise/Digimon virtual pets age while they are sleeping, the original ones were also able to evolve or die during their slumber.
- Discussed in The Simpsons, which is where the page quote comes from.
- Word of God is Ember from Danny Phantom died in her sleep however it was anything but peaceful. She died because her house burned down and she was too exhausted from being stood up from a date all night to notice.
- Played with in Avatar: The Last Airbender: Zuko receives a message telling him to research his great-grandfather's death. Later he asks Azula about it, who tells him that Firelord Sozin, their father's grandfather, died peacefully in his sleep, an old man. But Iroh wanted him to know about his mother's grandfather, Avatar Roku, who was betrayed by Sozin and left to die at an erupting volcano.
- Garfield: His 9 Lives: Happens to Garfield's six life, Diana, at the end of "Diana's Piano".
- In Il était une fois..... l'Homme, the Neanderthal incarnation of Maestro dies like this.