Guys get real laying for an hour or more when you desperately need sleep will leave you exhausted. You are just trying too hard ease up man and just let it happen
I agree with all of that, you pretty much have to relax yourself to the point of death (figuratively). It does indeed feel a little like dying.
The tricky part for me is when I can feel my conscious mind trying to relinquish control of breathing to my autonomous nervous system, it feels like I'm going to suffocate, you just have to take faith in your brain stem because at WORST, you stop breathing, pass out from oxygen deprivation, and then your body automatically kicks back in breathing for you.
Your best bet is to just keep doing quality practices until nothing about the process bugs you.