Space ship deceleration from speed of light

A space ship travels (almost) at the speed of light. When it nearly reaches its destination it starts decreasing the speed. What would be the most appropriate deceleration for human body in such conditions?

Astronauts endure around 3G on lift-off, which is about 29.4 $m/s^{2}$, but only for a short time. To decelerate from speed of light to zero then it takes nearly 4 months. Is there any condition that astronauts could be put in, so they can bear the pressure for such a long time, like cryogenic freeze or something else?

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Space ship deceleration from speed of light

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