The invention suggests a system for monitoring the exposure of a patient (1) to at least one environmental factor. The system particularly comprises a database (8) storing an environmental prescription for the patient, the environmental prescription specifying a maximum level of the environmental factor and a minimum duration for the level of the environmental factor to be smaller than the maximum level, and an evaluation module (7) configured to detect on the basis of a measurement signal and the stored environmental prescription a time interval in which a level of the environmental factor is below the maximum level and to compare the duration of the detected time interval with the minimum duration. On the basis of the result of this comparison, healthcare staff can plan activities in such a way that the patient is provided with a rest period substantially having the minimum duration.
