The Day cycle is the order in which the game's "day" cycle takes place. The order is as follows:
In Chibi-Robo!: Park Patrol, day is the time when Chibi-Robo can move freely. This is when most of the gameplay takes place.
In other Chibi-Robo games, most characters are available to interact with.
In other Chibi-Robo games, gameplay can also take place at night. This is sometimes when enemies will attack. Generally, characters other than Chibi-Robo will be in different places than during the day.