Ok, so for the past two weeks, both weeks I've had 2-3 day spans where I slept very little due to having to finish off school work. Every night I maybe slept 4-5 hours maximum. The first morning I could wake up fine. I'd feel a bit off, but coffee would keep going right through the day without issues. The second night, I woke up 4 hours, and I felt like a truck had just ran over me. I felt just awful. I hit the snooze, lay back down, and within seconds, I am in sleep paralysis. I had a nice little lucid, before having to wake up after my snooze went off. The same exact thing happened the following week.

So in practice my theory is low amount of sleep will cause some type of REM rebound the following night. Your body will also want to make up for lack of sleep from the previous night, making it extremely easy to WBTB. It is also much safer then sleep depriving yourself to experience REM rebound, because you are NOT sleep depriving yourself. You are only going through one day of low sleep. The second night when attempting, count on getting the full 7-10 hours. The cons - if you fail, it's two day process.

I'll experiment with this over my spring break... Alternate 4/9 hour sleeping.