The Grounding Bags are designed for you to co-exist with man-made EMF. So, technically you do not have to turn off devices at night.Even though the Grounding Bags work, we highly recommend you turn all devices off at night. Put your WiFi on a timer. Put your phones on airplane mode. Opt out of your SMART Meter by calling the gas and electric company and letting them know you want an analog meter instead. Quieting your home of all invisible stressors will allow the Grounding Bags to work even better. And put your phones in the Faraday Bags to slow down data harvesting.