A system configured to detect slow wave sleep in a subject during a sleep session, the system comprising: one or more sensors configured to generate output signals conveying: information related to one or more of cardiac activity of the subject or respiratory activity of the subject; and polysomnography information related to the subject; and one or more physical computer processors configured by computer readable instructions to: determine one or more cardiorespiratory parameters of the subject over time during the sleep session based on the output signals, the cardiorespiratory parameters including one or more parameters related to the cardiac activity of the subject and/or the respiratory activity of the subject; determine one or more polysomnography parameters of the subject over time during the sleep session based on the output signals; detect changes in the cardiorespiratory parameters over time that are indicative of onset of slow wave sleep in the subject; predict an upcoming onset time of slow wave sleep in the subject based on the detected changes in the cardiorespiratory parameters; and detect slow wave sleep in the subject based on the predicted onset time and the polysomnography parameters, wherein detection is more sensitive during a period of time following the predicted onset time. one or more sensors configured to generate output signals conveying: information related to one or more of cardiac activity of the subject or respiratory activity of the subject; and polysomnography information related to the subject; and information related to one or more of cardiac activity of the subject or respiratory activity of the subject; and polysomnography information related to the subject; and one or more physical computer processors configured by computer readable instructions to: determine one or more cardiorespiratory parameters of the subject over time during the sleep session based on the output signals, the cardiorespiratory parameters including one or more parameters related to the cardiac activity of the subject and/or the respiratory activity of the subject; determine one or more polysomnography parameters of the subject over time during the sleep session based on the output signals; detect changes in the cardiorespiratory parameters over time that are indicative of onset of slow wave sleep in the subject; predict an upcoming onset time of slow wave sleep in the subject based on the detected changes in the cardiorespiratory parameters; and detect slow wave sleep in the subject based on the predicted onset time and the polysomnography parameters, wherein detection is more sensitive during a period of time following the predicted onset time. determine one or more cardiorespiratory parameters of the subject over time during the sleep session based on the output signals, the cardiorespiratory parameters including one or more parameters related to the cardiac activity of the subject and/or the respiratory activity of the subject; determine one or more polysomnography parameters of the subject over time during the sleep session based on the output signals; detect changes in the cardiorespiratory parameters over time that are indicative of onset of slow wave sleep in the subject; predict an upcoming onset time of slow wave sleep in the subject based on the detected changes in the cardiorespiratory parameters; and detect slow wave sleep in the subject based on the predicted onset time and the polysomnography parameters, wherein detection is more sensitive during a period of time following the predicted onset time.