Default Is there any way to make daydream start at a certain time?

I just got a dock and want too use it next to my bed with my Nexus 7 as a clock. Android's daydream mode seemed to be the best option. I don't want my tablet's display to be on all night so I'd like the daydream to start about hour before I wake up. Is there a way to do that? In daydream settings it only allows me to daydream when docked or while charging. If there is no way to use daydream, can someone recommend a similar app that would do what I want?

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