Tablet [Q][HELP]Daydream not working on Galaxy Tab 3 8.0 sm-t311

I set to daydream to "on"...theri is no option to set when to daydream that is either charging or dock anyways when I plug in my charger, hit the power button, screen goes dark, and nothing happens.

I also tried waiting for the screen to go off without pressing the power button but still nothing happens.

How can I use the daydream feature. Please help