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|“|| It doesn't feel like 6 years; more like a fifth of tequila and an ass-kicking.
- Jake Sully
Cryosleep is "sleeping" or "hibernating" for long periods of time in a controlled environment. Cryosleep is featured in Avatar, where Jake Sully and other passengers cryosleep while they travel to Pandora. While cryosleeping, or "in cryo", a person does not age, does not dream, and does not need food or water. Technologies like cryosleep are licensed by groups like the RDA to keep humans alive and well for long periods of time. It is invaluable for long space voyages and for giving the avatars grown by RDA time to mature with their avatar drivers. Waking from cryosleep is described as being quite disorienting and highly uncomfortable, and the longer one is in cryosleep, the worse these side effects become. Some humans waking from cryosleep may experience nausea and extreme weakness, which explains the examinations caretakers perform on waking passengers on board the ISV Venture Star.
Cryosleep technology Edit
Cryosleep is not actually sleeping. It is freezing a person and maintaining his or her body at a very low temperature until the end of the "sleep", when the humans are gradually re-warmed and thawed out. The problem of irreparable cell damage caused by the formation of intracellular ice crystals was solved by using low doses of microwave radiation to jostle the water molecules as the temperature drops, which eliminates the formation of any ice crystals. The failure rate of this process is less than 1%. However, passengers and their heirs release the RDA for any liability as a condition of their employment.