A non-contact monitoring system can include an electrode configured to detect electrical signals from a surface of a subjects body without directly contacting the surface of the subjects body (e.g., via capacitive coupling). The electrode can be positioned at a spaced apart distance from the subjects body (e.g., ranging up to about 30 cm). The signals from the electrodes can be processed in the analog and digital domain to determine one or more physiological conditions of a subject, such as drowsiness.
