Review while I was sleeping - will it double the effort?

Over the past two nights, I had quite good sleep. But guess around 1-2 hours before I woke up, lots of CFA questions started to run through my mind. is it a good thing? anyone else had the same wired experience?

Of course that’s a good thing. You just got 1-2 more hours of studying in each night. And yes I’ve had the same experience.