Hi dave
I have had that problem too.it can get a little out of control sometimes I guess.not too sure why but I kind of feel like it is because of internal momentum. Once the flip gets switched, the momentum of the experience can snowball perhaps.

your story sounds similar to mine so far.I would get woken up several times a night with vibrations or astral sight, or other things and it got to the point where I just wasnt getting good sleep.it was almost like getting woken up by an alarm you cant shut off every two hours.very frustrating and I ended up being very cautious and reluctant to start trying to project again.

A couple things that helped me

Stepping away from the topic all together.basically taking a break from any reading or thinking about anything related to oobe.

Eating food before going to bed.