Computer-implemented method, computer program product, computer-readable storage medium and sleep staging device

A computer-implemented method for sleep staging of a subject, comprising:

• receiving first measurement data representative of a first physiological property relating to the autonomic nervous system of the subject;
• providing a first sleep stage classification by using a first sleep stage classifier to classify sleep stages of the subject based on the first measurement data;
• providing a second sleep stage classification by using a second sleep stage classifier, wherein the second sleep stage classifier is different than the first sleep stage classifier;
• determining a difference between a first performance of the first sleep stage classifier and a second performance of the second sleep stage classifier;
• determining multiple times over a time period, based on the difference, an autonomic modulation value representative of an autonomic modulation of the subject,
• wherein the autonomic modulation represents a relationship between the autonomic nervous system and a central nervous system of the subject,
• determining a change in the autonomic modulation value over the time period.