To use this on{X} Recipe, simply copy the code below and modify if needed.

/////////////////////////////////////////////////////////////////////
// Set the hours that you consider to be night. Use military time. //
/////////////////////////////////////////////////////////////////////
var startNight = 23;
var endNight = 6;

/////////////////////////////////////////////////////////////////////
// Begin night mode logic										  //
/////////////////////////////////////////////////////////////////////
function setDataRadios(value) {
	var enable = value == 'enable' ? true : false;
	try {
		console.log('Setting data to "' + value + '".');
		device.network.wifiEnabled  = enable;
		device.network.mobileDataEnabled = enable;
	}
	catch(e) {
		console.log(e.message);
	}
}

device.scheduler.setTimer({
	name: 'wifiNightMode', 
	time: 0,
	interval: 'hour', 
	exact: true },
	function () { 
		var currDate = new Date();
		var currHour = currDate.getHours();
		
		switch(currHour)
		{
			case startNight:
				device.localStorage.setItem('wasWifiOn', device.network.wifiEnabled);
				setWiFiRadio('disable');
				console.log('Turning off wifi');
				break;
			case endNight:
				if(device.localStorage.getItem('wasWifiOn') === 'true') {
					setWiFiRadio('enable');
					console.log('Turning on wifi');
				} else {
					console.log('Wifi was originally off: no action');
				}
				break;
			default:
				//console.log('No data action');
				break;
		}
	}
);