You can use also MMM-ModuleScheduler with MMM-Remote-Control to turn monitor on/off if you don’t need to turn off the whole system.

It works similar to crontab

Here is example from my mirror configuration

   {
      module: 'MMM-Remote-Control'
      // uncomment the following line to show the URL of the remote control on the mirror
      // , position: 'bottom_left'
      // you can hide this module afterwards from the remote control itself
    },

   {
        module: 'MMM-ModuleScheduler',
        config: {
            notification_schedule: [
                // TURN THE MONITOR/SCREEN ON At 10:00
                {notification: 'REMOTE_ACTION', schedule: '00 10 * * *', payload: {action: "MONITORON"}},
                // TURN THE MONITOR/SCREEN OFF At 00:00 
                {notification: 'REMOTE_ACTION', schedule: '00 00 * * *', payload: {action: "MONITOROFF"}}
            ]
        }
   }