A patient movement monitoring system comprising sensing hardware (100) which can be in the form of a sheet or planar member that is placed under a patient who may be susceptible to pressure ulcers due to lack of movement. The sensing hardware can comprise two or more energy harvesting devices (102) with each energy harvesting device (102) being configured to output a current in response to detected patient movement. Each energy harvesting device (102) can comprise a piezoelectric device. The system can also comprise a wirelesss transmitter (105) that can be powered by at least one of the currents and on receipt of said currents transmits at least one data packet representative of the detected movement, a network that communicates the respective currents from the energy harvesting devices to the wireless transmitter (105) and a remote receiving device (106) or computer running sensing software (108) that processes the at least one data packet and provides an output of said data for analysis.
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