I find that even among those of us on this forum, we struggle to understand each other. But I would try to explain my perspective on things like this:
For me, meditation is not something confined to 2 hours a day, or a particular sitting, or a retreat: but, if done correctly, it is something that is integrated into my minute-by-minute, daily existence. Mysticism, by extension, is not a spooky side-interest, but a life-process, something that engages with me holistically - intellectually, emotionally, and sexually - and transforms me as a whole. From a fragmented, confused self - a worldling mired in this material world - I re-make myself into something solid, certain, and strong. I become far-removed from fantasy, from pain, from un-reality. I re-make myself in conformity -with Reality-.
One way to understand the method of the mystic is as asceticism (in Greek, "askesis," meaning "exercise" or "training"). In Sanskrit, they use the word "tapas," which literally means "heat." What this "heat" can mean is the friction of your fragmented, material self coming into contact with your more excellent, otherwordly self: that part of you that demands more, intuits more, and is in open revolt against your fragmented self. This conflict can create literal heat. It can raise your body temperature.
John of the Cross divides the period prior to being on Jhananda's level into two dark night periods. These are the Night of Sense and the Night of Spirit. From my own judgment, the first dark night precedes the experience of the first and second samadhis, so if you are experiencing them that implies to me that you have passed through it. The second dark night, the Night of Spirit, transports us into a completely foreign land. It provides us with the third and fourth samadhis, and eventually, the religious experience proper.
The second dark night, and the pain of it, is particular to each person. But is is immeasurable and violent. It is a ravishing of your spirit, a taking you out of yourself, a submersion of you into blankness, blackness, and affliction. It is like taking a piece of wood (to use St. John's analogy), filled with moisture, and then slowly drying it out and taking the moisture out of it. This is done so only after can the wood become fire: can it be spiritualized, exalted, and empowered in a real sense.
The second dark night abolishes fantasy, liberality, and the surface consciousness. It takes you onto another plane, one which is very different from that of these earthlings. There are no more digressive thoughts. There is only a constant and powerful intensity - a divinity, even. This creates the proper setting that enables you to experience the more excellent samadhis and charisms.