You may find "Twenty Five Doors to Meditation: Handbook for Entering Samadhi" by Bodri interesting. Most people don't meditate correctly or go deeply enough to

You may find "Twenty Five Doors to Meditation: Handbook for Entering Samadhi" by Bodri interesting. Most people don't meditate correctly or go deeply enough to enter the breathless state. A lot of the popular teachers of mindfulness meditation (Kabat-Zinn, etc) never mention what happens when you allow your body to become totally still and ignore sensory input (or even that you should). Yet this leads to the Taoist's Original Breath, or Patanjali's spontaneous Kumbhaka, where the breath naturally suspends for long periods of time, and is really the doorway to deep meditation. Sorry for people wanting medical science here - materialistic science has inherent limitations when trying to deal with subjective experiences such as the nature of consciousness itself. You'd have to convince yourself if you were interested that the states reached by e.g. intent concentration on the breath is experientially very similar to those arrived at by other methods. BTW: I can see from your comment you've either never practiced Zazen, have no experience of it or have had a charlatan teacher.