I can't believe I haven't even thought about my mistake before.

Every now and then I have the urge to set myself a WBTB alarm, but I always wake up, write down a dream if I remember one then head straight back to sleep. I never actually exit my bed. I'm going to have a proper shot at WBTB tonight, set an alarm and actually wake up for 15-30 minutes until I can think straight, then go back to sleep.

I'll post here with the results.