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A body area network (BAN) for monitoring the autonomic nervous system responses is reported. The BAN is based on the Human++ UniNode, a small, low power generic wireless sensor node. Physiological signals are monitored using specifically designed ultra low power sensor front ends connected to the UniNodes. Two UniNodes compose the body area network, one on a chest belt to record ECG and respiration, the other on a wrist sensor to record skin conductance and skin temperature. Small, lightweight and low power body area network platform, this platform BAN platform paves the way towards ambulatory, continuous monitoring of autonomic responses in everyday applications.