I took a workshop in Theta healing years ago. They teach you how to move your consciousness out through your crown chakra up above your head at least 6 feet or more(then you enter the person you are working on and through their crown chakra and take a systematic look around for problems)
This is all done while slowing your brain waves to theta .
This is the same brain state that monks and nuns are in for deep prayer.
Grounding yourself is taught first. so that you are tethered to the ground like a kite.
Imagine you have thick strong roots moving deep into the earth, then see them branching out into many smaller roots even deeper. When you feel safe and well connected, then you can attempt to project your consciousness higher.
I always find myself out in space floating and soaring as I feel like it,getting comfortable with the sensation, before I come back to do the work.

We all do, it all the time. We are just so tired when we sleep, we can't remember them. We are constantly going in and out of Delta wave lengths. That is where we find ourselves in REM sleep. REM sleep is where we go into dream states. In between the Delta states, we go into a simi conscious state called Theta. When we go into Theta state is when we can leave our bodies. We only remember them as dreams, because the Delta states are like bookends of the experience. If you go into a long Theta state, just before going to sleep, or just before getting out of bed, you will have an OOBE. I would suggest not drinking any liquids before bed.
First thing you need is plenty of rest. You can't have a severe pain or other physical distraction. You need a pure and relaxed mind. Some very soft music may help. If you are exhausted with fatigue, your Theta will be too short and you will go into Delta, quickly. This is something you might want to do on a relaxing vacation. Some medications can help, but is an indirect reaction to medication, Any way you can experience a long Theta will do the job.
The OOBE is experienced two different ways. The first kind is post realization. You know you had went somewhere new. You go there and it is verified. Another of the first kind is looking back at your body and not realizing that is what you were looking until later. In the second kind of OOBE is where you actually finding yourself leaving your body and know that you are doing it at that time. The fear factor is the greatest you will ever feel in your life. It is so bad, you may give up on the idea completely. This is the biggest challenge of the OOBE. You have to be the one of the bravest persons on the planet to do it, Otherwise, it is harmless.

I have done it 3 times ......once when I got knocked out in an axedent ..and I found myself sitting in the drivers seet and I was not the driver ..the car was on its side ...I looked dowen at my self ..and my hair was frizing to the window it was in the winter ...and I wasent moving ..I thought that dident look to good so I tried to get back into my Bodie ...and had a hard time connecting back up ..it was a little scary at first ..but than I conected ...and my h got me awake and standing up and it was exactualy what I saw when I was out of my body .....it was amasing ...........one time I was .in a light sleep and I found my self ..in a very dark place ..than I could see a light so I went to it I had the feeling somthing was not right ..I came up to a man the light just was around him ..I think I was making the light much like a flash light ...but from above ..so I was comming up from behind him his foot was realy stuck in the track ....so I looked dowen each way of the track and felt that ..it was clear no train comming ...so I tried to come around and look into his face ..since I knwe he was safe just a hurt foot .....but than I relized that I schould not bother him ..incase I disterbed him and he dident get his foot out in time and I slamed back into my body ....so when my h came home I ..told him you hurt your foot at work tonight he said yes how did you know ..I told him what foot and how he hurt it ...and then I told him how I knew ...........a nother time .............I was having a extream
Y bad migrain ...and I just popped out ....the pain stoped ...because the body was feeling the pain ....so I kept an eye.on my self ..to make sure I was still breathing ..I watched my h go around the house about his bisness ..and checking on me ....I have no idea how long I was out there doesent seam to be any time when you are out of your body ...at least it isent the same ...when I went back into my body the migrain was over ..........I don't think I like the idea of going out of my bodie ....so I don't try to do it ..I think I could if I praticed .but not interested .....