#1--What if humans had to hibernate for three months every year?

I'm assuming that this is a biological need like people having to sleep eight hours a night. So, in early human culture, tribes of people would work together to establish a protected cave in which to take refuge during their seasonal hibernation. As cultures advance and larger groups of humans live together you might see an offsetting of hibernation times until eventually we have roughly equal amounts of people hibernating at any given time.

Some families would opt to hibernate together so they could spend their non-hibernating time together. Others would offset their times within the family so you would have a trusted family member looking out for you in your dormancy. Big businesses would be developed around the safety and security of people when they were in hibernation. This leads to vast hibernation districts in cities. These areas have strict noise ordinances and curfews and are mostly filled with buildings containing huge banks of hibernation chambers, kind of like the Japanese capsule hotels.

There is a kind of caste system where the majority of the rich take their hibernation during the winter months, while the poor have to rely on government sponsored hibernation schedules.