I have a quest to build the Dream Room. So far I haven't seen any explanation of what the Dream does. The in game text says:
After observing that monsters evolved during a prolonged deep sleep, Phineas Alexander suggested the explorers build a specialized hibernation center known as the Dream Room. Carved into an enormous tree, the building ensures the creatures have the most relaxing and peaceful sleeping situation possible while simultaneously protecting them during hibernation.
What do I use the Dream Room for?