But people have survived many years without hardly any sleep. Both dreaming and non-dreaming sleep are neccessary to maintain health and vitality. Time has no accord in dreams. Happenings separated by decades can be brought together in the same instant. The dreamer might be transported into the past or even the future.
Space has no meaning in dreams either.
The only laws it obeys are its own. The dream world is very fluid. Known places can be distorted or appear in far away locations. One such instance is your home being larger or smaller or having different rooms added on. Some of them dramatic and overly exaggerated and in some strange way tend to lack a right or a wrong.