If your room is dark, there's no reason to believe that opening your eyes briefly will wake you up by a noticeable amount. In fact, there's a technique called "reverse blinking" that some people use to make themselves feel more tired. It probably wouldn't help with DEILD, but it shows that briefly opening your eyes doesn't necessarily mess it all up.
To answer #3, I would say that this is the "hard part" of DEILD. It's up to you to discover how to strike a balance and let your thoughts become illogical without losing consciousness. Practice makes perfect.
#4: Theta waves most likely. If you cross over into alpha then you can't DEILD. Don't let that happen
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