The present invention relates to a system and method for determining sleep stages of a person, including heart rate detecting means configured for detecting a heart rate of the person, movement detecting means configured for detecting a movement of a part of the body of the person, where the detected movement is caused by a skeletal muscle of the body, recording means configured for recording the detected heart rate and the detected movement of the part of the body, heart rate classifying means configured for classifying the recorded heart rate of the person into at least one heart rate class, movement classifying means configured for classifying the recorded movement into at least one movement class, and determining means configured for determining a sleep stage and/or a sleep event of the person based at least partially on the at least one heart rate class and the at least one movement class.
