Sleep paralysis to induce astral projection?

Could somebody explain to me if it is more beneficial for me to be well rested or extremely tired when attempting to induce sleep paralysis? What I'm asking is, if I'm tired, would that help speed up the process of sleep paralysis? Or does it take at least 2 hours no matter what?
Update: CHRIS:
That's what I'm trying to do. I want to lose my way and stay out of my body.
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