Experience is a word that covers almost all the happenings in yoga, only when something gets settled thenit is no longer an experience but part of the the siddhi; e.g. peace when it comes and goes is an experience ó when it is settled and goes no more it is a siddhi.

If the rift in the lid of mind is made, what happens is an opening of vision to something above us or a rising up towards it or a descent of its powers into our being.

A light descends and touches or envelops or penetrates the mind, life or body; or a presence or a power or a stream of knowledge pours in waves or currents; or there is a flood of bliss or a sudden sudden ecstasy; the contact with the superconscient has been established. For such experiences repeat themselves till they become normal, familiar and well-understood, revelatory of their contents and their significance which may have at first been involved and wrapped into secrecy by the figure of the covering experience. For a knowledge from above begins to descend, frequently, constantly, then uninterruptedly, and to manifest in the mindís quietude or silence; intuitions and inspirations, revelations born of a greater sight, a higher truth and wisdom, enter into the being, a luminous intuitive discrimination works which dispels all darkness of understanding or dazzling confusions, puts all in order... The heart and the sense become subtle, intense, large to embrace all existence, to see God, to feel and hear and touch the Eternal. Immortality becomes no longer a belief or experience but a normal self-awareness. No limit can be fixed to this revolution; for it is in its nature an invasion by the Infinite.

The descent is that of the powers of the higher consciousness which is above the head. It usually descends from centre to centre till it has occupied the whole being. But at the beginning the action is very variable. It is only when the Peace from above has not only descended but established itself in the whole system that there is a continuous action. The descent comes in order to transform the consciousness but the transformation takes time. It is not done all in a moment.

On a height he stood that looked towards greater heights.
Our early approaches to the Infinite
Are sunrise splendours on a marvellous verge
While lingers yet unseen the glorious sun.