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what kinds of wake ups can we do?

I know of wake up attacks with special moves but what other kidns are there? SOme people seem to stay on the floor, some roll, some stay down AND roll. What are these and how do you do them? Are there any others?
 
Okay so what is the timing of the input?

I find myself doing nothing when I hit down or any button I don't get any back rolls. Is there any specific timing for this?