Daydream instead of Sleep

[Ryanodine]

Hi,

I want to use the setting involved with how much inactivity triggers the device to go into lower activity mode, but instead of going to sleep (display off), I want daydream to be active. I really only want sleep to be active if I press the power button. Does anybody have any suggestions of apps that cover this feature? I'd prefer not to root, but suggestions down that route (har har) are appreciated as well.

Thanks!