Mars

I dreamt that Mars had cycles of deep-freeze and thaw periods. The deep-freeze periods last about 4,000 years, the thaw periods about 40,000 times that.

I dreamt that it was in one of the deep-freeze periods and I was there rescuing Martians that appeared very human but were very different.

The Martians had inherently extremely long life spans, and their population was relatively small, however, they had an ability to hibernate but only about 10% of the population would survive the 4,000 year deep-freeze cycle.

After each freeze cycle the planet would warm up, the atmosphere would thicken, liquid water would become available on the surface, and the Martians would rebuild their civilization. They had a method of recording and saving information across the freeze so that from an information and knowledge standpoint they could pick up where they left off instead of having to start over from scratch.

The Martian physiology allowed them to take oxygen in through means other than breathing it though they could breath, but this ability would allow them to function in the absence of atmospheric oxygen.

I was there during a time in the cycle where many who would not survive would die and I was trying to rescue them.