I think that for most people any information about death is virtually almost irrelevant until it is more and more correlating with the subject. On the Internet, we can see the information about catastrophes, wars, hunger occurred somewhere, but even death happened next to you is not necessarily significant for some people. There are plenty of people who like to speak about death by repetitively savouring trivial phrases, introduced by some wise men, but still it is the experience only of wise men, but not a repeater. That’s why yoga is, first of all, an experimental research of oneself, of something we don’t know, or barely know, or have forgotten. We know nothing of afterlife, we have no proof of rebirth or other things except for only sayings of some people and different religions.
And what is yoga for? Yoga proposes to study death on practice. Actually, yoga is a gradual immersion into the experience of death, not external, but your own. If we refer to the states of death, described in Vedanta, Tantras, Yoga texts, all of them – from jāgrat to turya or turyatita – illustrate a gradual transition from objective self-awareness to more and more subjective one. If you correlate yourself with your dreams in svapna, then in suṣupti you correlate yourself with a reality beyond mental constructions. In turya, you realise yourself beyond all the three stages, and use this experience to study yourself as their witness, where all of them serve as supporting instruments of self-awareness. You are Nirālamba Śhiva (Unsupported Shiva) and do not need any of these instruments in turiyatita. In yoga, you slow down the process of breathing by practicing prāṇāyāma, thereby you can gain a more thorough insight into the dimension, revealing itself from the experience, which is usually seen as death.
In India, death is usually divided into two categories: natural and unnatural. Unnatural death is sudden, for instance, from accident, when a person abruptly falls into the unconscious. Natural death, even if it is not strongly perceivable, has at least a more or less smooth transition. Yoga sets the goal to make that process as smooth and conscious as possible, and, at the same time, to get the knowledge of something, which goes beyond what we usually see as life. As I see it, to a greater extent it is connected with the accomplished prāṇāyāma practice.
First of all, yoga offers a self-study of our own unconscious, which is the fundamental goal of a human being. It transcends him from the human to the yogiс level. Some say about stages of videha-mukti (liberation attained by a person after death), some – about sadeha-mukti (liberation while still in the body), however, I see it as a combination of both. Yoga is nothing more than laying a bridge between two realities, and only by this experience we can comprehend and see for ourselves: is there rebirth or not, is there a soul or not, is there God or not. I think that the true knowledge (jñāna), is contained in the yogic experience in particular, none any over-prestigious traditions, nor Gurus, books or theories will give you this knowledge, until you reveal it yourself. Of course, there are huge benefits in traditions, but the true value can be gained only when you are fully correlated with it, otherwise a tradition is worth no more than a visit to a pub. A person can try on a tradition as many times as they want, even not accepting the fact that it remains something secondary for them, after a favourite pub, the Internet, McDonalds or anything else. Do you fully correlate with it or not, that is what you need to think of.