PROBLEM TO BE SOLVED: To reduce a burden on a nursing person by enabling the nursing person to grasp timing of a child waking up to prepare nursing action by using a period until the child wakes up.SOLUTION: A wake-up notification system (100) used in a space in which a child is sleeping includes a robot 10, a distance image sensor 12, a mic 14, a temperature sensor 16, a humidity sensor 18, and an illuminance sensor 20 which are provided around the child. The wake-up notification system (100) acquires wake-up factors for predicting a wake-up of the child by using these sensors; inputs the factors to a determination model created by a machine learning method for outputting, as a prediction result, a probability of a wakeup after a predetermined period; determines that the child is to wake up within the predetermined period when the possibility of the prediction result is higher than a threshold; and transmits a message for notifying that the child wakes up within the predetermined period to a portable terminal 22 of a nursing person.
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