Setting chip to idle state in between measurements

In order to reduce current consumption, I want to set my nRF52832 chip to sleep in between ADC measurements. I'll only be recording one measurement every 5 minutes or so, and my board is on a wearable device powered by a 40 mAh battery, which I want to last for at least 12 hrs.

Are there any functions I can use compatible with BLEPeripheral and PlatformIO? 

Thanks in advance!