I'm having a hard time of it too. I tried it yesterday morning, to the letter, but still couldn't concentrate and kept drifting off. I only had an hour and a half after the 7 hour wakeup-and-immediately-BTB point, so maybe I just missed an REM phase. Tonight I'm going to try it like I did last weekend, with a full 1 hour WBTB between hours 6 and 7.