Hypnosis is a gray area of meditation between astral projection, lucid dreaming and out of body experiences.It is used to cleanse ones self of negativity, bad habits and even thoughts.
You start with meditation and as you go deeper and deeper into meditation you loose your sense of surroundings. This is the gray area while in deep meditation you control yourself to shut off the outside world the worlds on the astral plane, and the want to go out of body, or even lucid dreaming.
So this gray area is (said to contain many spirits) so if you know you are trying to rid yourself of something, you let it go here. If you are trying to gain something you can search yourself easy and discover it.
Getting out of this state would be much like astral projection where you have to find your physical body. The easiest way to explain it is making yourself remember to wake up.
This plane as stated is said to have many spirits and you may want to protect yourself through asking for protection from a god or goddess or by crystals.