@mun_96: Sleeping apps will run in the background only occasionally, and delay updates and notifications. Deep sleeping apps, on the other hand, will never run in the background and will not receive updates or notifications. They'll only work when you open them. Restricting background data usage will stop any background activity for web based apps while you're connected to Mobile Data. If this option is of interest, head to Settings > Connections > Data usage > Data saver > Turn on now.