That also happened to me the first few times I did WBTB. Last night I did it, staying up the longest I have so far, and it went pretty well. I didn't recall dreams the way Id like or successfully execute a WILD as Id like; however, when I went back to sleep, it was much easier to fall asleep, plus that dream feeling was much easier to access. After a few attempts, it seems like my mind is getting use to the idea.
Honestly, it has taken months just to get to the point where I can will myself out of bed in the middle of the night. So good job on that part, everything from this point on is the fun stuff