Author's note: This is from Seraphina's point of view
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After returning home, I went back to answering emails.
I was pleased to confirm that this correspondence getting easier (and faster) the more I do it.
I even found some time to read Aldus's research on eternal sleep.
In his notes, Aldus compared a body with a battery, and he said that eternal sleep is a state that a vampire enters when he runs out of energy and shuts down, like an empty battery.
It sounds simple. If the battery (aka the body) is recharged, the person will wake up.
Unfortunately, the body can run out of energy due to various reasons, and the type of energy can be different as well, so it's not straightforward.