I tried another WBTB last night successfully! I am getting 6 hours of sleep now, then staying awake for half hour. During this half hour I usually get up and walk around, then read for a bit on dreaming, etc. I woke up fine after 1.5 hours upon going to sleep again and wasn't groggy. As a side note, I've had 11 LDs, 10 of which were WBTB. I have a 100% chance of an LD if I use WBTB.