I hate it when people confuse normal dreams with OBEs.

Sleep paralysis and vibrations are all part of the sleep process. Just becuase your in sleep paralysis doesn't mean your having an OBE. Personally I don't believe they're even possible, but even people who do will tell you that these experiences happen for regular dreams as well. Doctors see them as stress related becuase generally your not suppose to notice them. Lucid dream induction techniques such as WILD can cause you to experience them while awake. This is completely normal and in no was dangerous.