Reference article
Day and Night
The village follows a twelve-minute day-and-night cycle. Ducks work during the day and head to their homes to sleep at night.
Evening and morning
Sunrise and sunset separate daytime from night. Ducks begin heading home around sunset, so keep routes to their houses clear. At sunrise, a message totals the Crystal Feathers earned overnight.
Rest and rewards
Sleeping restores a duck’s tiredness. Better 
Housing increases the number of 
Crystal Feathers its night’s rest can earn. Ducks studying at school do not earn sleeping rewards, and your exploring or training duck is not resting at home.