When I have a full blown OBE I have to
Roll Out.
I get stuck at the crown if I do not roll out anymore.
There have been times where my 'feet' are up toward the ceiling and I can't get 'out'.

Very Annoying...
Then as of late I have felt the vibrations and just happened to BE somewhere else.
Very Odd!
I also have been having a hard time 'Getting Around' and being able to see clearly.
As if someone/something is blocking me....
Probably myself doing that somehow...
EDIT to B2: If you ever had a Lucid Dream then you have had a form of an OBE.
I firmly believe a Dream IS a OBE except we are in 'Dream State'.