1. A monitoring system for automated monitoring of a patient and detecting delirium of the patient, comprising: a monitoring unit for obtaining image data of the patient over time, an image analysis unit for detecting motion events of the patient from the obtained image data, an evaluation unit for classifying the detected motion events into delirium-typical motion events and non-delirium-typical motion events, wherein said evaluation unit is configured to determine high and/or low movement counts of detected motion events, and a delirium determination unit for determining a delirium score from the duration of high or low movement counts and/or the duration, intensity, type, location and/or occurrence of delirium-typical motion events, said delirium score indicating the likelihood and/or strength of delirium of the patient.