Between asleep and awake is pretty accurate, but don't mistake this for being in just a really good meditative state or being really relaxed as you can still be pretty far away from an OBE. When you are about to have an OBE, you will definitely know it because it's unlike anything you've ever experienced especially if you have a strong tendancy toward having vibrations first. But the thing is the vibes come on quickly and there is really no way to know (that I know of) if you are gettting close. Just being relaxed is not enough (but definitely helps). It's kind of like waiting at a train station and either your party shows up or they don't. Still, you have to be at the train station if you are going to meet your party at all.