Can the book "Learn to Out-of-Body Experience in 30 Days" really learn to out-of-body experience?

What I learned that day, I read OBE's post and told you the general meaning. Out-of-body experience means that the body is asleep, and consciousness wakes up at the moment when the body is asleep, which is similar to the feeling of a ghost pressing the bed.

I read the post like this: 1, I slept 2 hours later than usual that night and got up earlier than usual in the morning 1-2 hours. After getting up, you will have a strong sense of drowsiness. Don't fall asleep, stick to 10 minutes, and then stay awake when I lie in bed. Within 5 minutes, there was an external signal, a kind of tinnitus, and I didn't want to be in it.

I'm a yogi, and I don't have any theories, but people with poor talents can't leave the body 1 year, and they may not learn it in 30 days.

There is no danger of leaving your body, please rest assured.