I didn't read the article totally but this experience seems to be a result of incorrect practice. Just meditation without mastering the previous steps of Ashtan

I didn't read the article totally but this experience seems to be a result of incorrect practice. Just meditation without mastering the previous steps of Ashtanga Yoga is not advisable. Yes - you can use it but not as the main vehicle for your practice. I meditate daily - between 1/2 hr to an hour. I do not have the time to spend doing it for hours at a stretch. I do not think I have the temperament to do it either. Forcing myself to do it for hours on end is repressive - the focus and concentration should come about naturally. Even then a highly contemplative practice is not recommended without the close and personal guidance of a Teacher (or Guru).