Realistic cryosleep with short or no wake-up protocol?

I read that our current method of cryonics involves replacing blood with other fluid and keeping the body submerged in liquid as well as on ice (these things being done to the dead, for now, instead of intergalactic explorers and such), and that the process of waking a person up from this sort of 'cryosleep' (if they were alive when put under) would be intensive and time-taking.

I'm wondering if there are any (probably hypothetical) alternatives to the method we have now that would have a shorter wake-up interval or no real protocol for that at all (where a person in cryosleep could just wake up without assistance or any real, serious injury). How could this sort of technology realistically exist?

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Realistic cryosleep with short or no wake-up protocol?

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