see this could work but there are complications for being in a lucid dream for that long. after a while the brain will start to generate random things, a lot of which could be nightmareish or even your subconsious showing you your own frozen body (this has happend to be before, i was able to look at myself sleeping through a dream) it wont show the events outside of your room in real time but your brain knows how your sleeping and knows where you are, therefore letting you see yourself through a dream if you choose to. also lucid dreaming in cyrosleep could force you to dream about extremely cold things (so cold that it could be unbearable even in a dream and unchangeable unless you really dont focus on the cold.
this is just my knowledge of lucid dreaming so far so i could be wrong or there could be more things wrong with it. sorry for making you read allat