How do you keep WiFi on when tablet is asleep?

[abel920]

I have the Lenovo Miix 2 8, and everytime I download something I want to conserve battery by turning the display off and putting the computer to sleep. The tablet doesn't have the option to "turn off the display" only, but it has Sleep instead. It is so annoying, especially when I download something, I have to keep tablet on and its really distracting and drains battery.

I'm assuming this is the same issue with 8-inch W8.1 tablets?

If so, how do I enable the "Turn of screen after xy minutes" option?

 

[Nokia Boy]

If its a Windows 8 tablet,it should the same as computer..(created a little tutorial for it)