1. A method for providing a physiological event marker, the method comprising: receiving a physiological signal from a sensor; determining, using electronic processing equipment, at least two of: pulse rate, pulse statistical moment, and photoplethysmograph (PPG) DC offset based on the physiological signal; monitoring, using the electronic processing equipment, at least one composite metric value determined based on a combination of at least two of the pulse rate, the pulse statistical moment, and the PPG DC offset; determining, using the electronic processing equipment that, a physiological event has occurred based at least in part on the at least one composite metric value and based at least in part on at least one threshold corresponding to the composite metric value; and storing the physiological event marker indicative of the physiological event occurring.