power management nrf52840

Hi, 

I am using nrf52840 chip, there is Thread and iot coap library, and movement sensor. When sensor detect move, pin call interruption and send coap message. 

Voltage is 3.3V and current is 42.5mA

In sleep mode is current 28mA 

I want to use it on battery power. 

How I decrease power? 

Thank you. 

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