Methods for characterizing a circadian rhythm of a wearer of a wearable device are provided. In one example, physiometric measurements are obtained over a period of time by one or more sensors of a wearable device configured to be mounted to a body surface of a wearer. A circadian rhythm of the wearer, such as a sleeping, waking, eating or movement pattern, is characterized based on the physiometric measurements. Based on the identified circadian rhythm, one or more settings of the wearable device, such as a timing or frequency of obtaining physiometric measurements, may be adjusted.
