[zelphirkalt]

... of agonizing pain.

Perhaps simply falling asleep at appropriate age and not waking up is to be preferred.

[lrem]

I suggest listening to Stuff You Should Know on this matter. Apparently dying in your sleep isn’t really a thing.

[tchaffee]

It can be with medical assistance.

[seunosewa]

Like a heart attack during your sleep? It might wake you up before it takes you out.