[You also need room to store their food, water, environments, living space for Noah and his wife and sons, rooms and space for things that keep the boat structurally sound, etc etc. He also needs to keep careful track of each and every pair of species AND provide a specific type of food unique to them. How is he preserving all this food and meat, anyway? The refrigerator hasn't been invented yet.]
They lived with the animals, not too strange..my dogs sleeps on my bed each night, lol
if the animals hibernate then food supply would be short on purpose.