Presumably natural death is the acceptance of everlasting sleep, hence the euphemism about 'falling asleep'.

For a great weariness comes upon mariners in that region, and a loathing of the sea; but all such as set foot upon those islands are there entrapped and wound in everlasting sleep.

From this hill, unaware that their lives were soon to change, Dylan and Shep had watched the spectacular December sunset that their dad had viewed through a haze of Nembutal and carbon-monoxide poisoning as he had settled into an everlasting sleep.

She slept more tranquilly--but her fever increased; and slowly she slept away into the everlasting sleep which knows of no to-morrow.

Sometimes B'dikkat took the new ones, resting in the everlasting sleep of their burned-out brains, in a ground-truck to be added to other herds.

Conan stared after that silent figure that receded into the blackness on soundless, inexorable feet as one that moves to a known and inevitable doom, or returns to everlasting sleep.

The magic isles, filled with enchantment, are strung across the confines of the Shadowy Seas, before the Lonely Isle is reached sailing West, to entrap any mar- iners and wind them in everlasting sleep and enchantment.

When life became an aching weariness, death was ready to soothe away to everlasting sleep.

Send out thine opiate breath, And lull me to the everlasting sleep, That, closing from the kisses of disdain To ecstasy of pain, I may sob out my life into their dangerous deep.

- In QS mariners who set foot upon the Enchanted Isles 'are there entrapped and wound in everlasting sleep'; in AAm they 'were there entrapped, and slept until the Change of the World.'