So what is life like for a mother-to-be hen? Most of the time, day and night, it is sitting quietly on her eggs. She is also gently turning the eggs many times a day. This keeps the embryo centered in the egg and prevents it from sticking to the shell membrane. She also protects the eggs she is sitting on and will keep other hens and predators from getting into her nest. (The squiggly lines on the eggs are ones I drew to mark the eggs she started incubating.)
Of course, a hen doesn’t have a servant to bring her food and water. At least once a day, she has to leave the nest to eat, drink, go to the bathroom, and get some exercise.
Afterwards, she is back on her nest until the next day.