Techniques are disclosed for generating user information from autonomic nervous system (ANS) parameters and continuous ANS monitoring. Some embodiments may provide a wearable device, comprising: a photoplethysmography (PPG) sensor a motion sensor and processing circuitry configured to: determine one or more monitoring conditions determine whether the one or more monitoring conditions are satisfied based on monitoring motion data from the motion sensor capture the blood flow data with the PPG sensor when the one or more monitoring conditions are satisfied determine time-interval data indicating times between pulses based on the blood flow data determine an ANS condition based on the time-interval data. The blood flow data and/or time-interval data may be captured and aggregated from multiple discontinuous periods of time when monitoring conditions are satisfied. The processing circuitry may be further configured to control output devices for presentation of the ANS condition(s), such as an actuator of the wearable device.
