When Wilding do you have to open up your dream eyes and when would it be a good time for me to do so?

I have just started Wilding and the first time I actually went pretty far to the point where i was hearing sounds (Sounded like car crashes or gunshots) I would wake up so fast that i'd get annoyed. I've been reading a bit and alot of people have said they opened there dream eyes when wilding so i wanted to know if thats what i had to do. Also What exactly do I have to do when i'm in SP, because at that point i just randomly do things that never seem to work or i just fall asleep.

O also do I have to sleep 5-6 hours before i try and wild or can i just try it?