There are four definitions of a spiritual awakening in our major works. Two mention God or Higher Power and two do not. All four mention a major change in our attitude and perception. Therefore, the latter seems to be the defining element in this phenomenon. There are two firsthand accounts in the Big Book of sudden experiences leading directly to 'God consciousness'. An appendix The Spiritual Experience was added for the expressed purpose of explaining that this type of experience is not universal.

Big Book:

“The great fact is just this, and nothing less: That we have had deep and effective spiritual experiences which have revolutionized our whole attitude toward life, toward our fellows and toward God’s universe. The central fact of our lives today is the absolute certainty that our Creator has entered into our hearts and lives in a way which is indeed miraculous.”
Page 25, There is a solution

“ 'Here and there, once in a while, alcoholics have had what are called vital spiritual experiences. To me these are phenomena. They appear to be in the nature of huge emotional displacements and rearrangements. Ideas, emotions and attitudes which were once the guiding forces of the lives of these men are suddenly cast to one side, and a completely new set of conceptions and motives begin to dominate them.' ”
Big Book, page 27, There is a Solution (Dr Jung to Roland H)

"He finally realizes that he has undergone a profound alteration in his reaction to life; that such a change could hardly have been brought about by himself alone. What often takes place in a few months could hardly be accomplished by years of self-discipline. With few exceptions our members find that they have tapped an unsuspected inner resource which they presently identify with their own conception of a Power greater than themselves.

"Most of us think this awareness of a Power greater than ourselves is the essence of spiritual experience. Our more religious members call it 'God-consciousness.' "
The Spiritual Experience

12 & 12:

"Maybe there are as many definitions of spiritual awakening as there are people who have had them. But certainly each genuine one has something in common with all the others. And these things which they have in common are not too hard to understand. When a man or a woman has a spiritual awakening, the most important meaning of it is that he has now become able to do, feel, and believe that which he could not do before on his unaided strength and resources alone. He has been granted a gift which amounts to a new state of consciousness and being. He has been set on a path which tells him he is really going somewhere, that life is not a dead end, not something to be endured or mastered. In a very real sense he has been transformed, because he has laid hold of a source of strength which, in one way or another, he had hitherto denied himself. He finds himself in possession of a degree of honesty, tolerance, unselfishness, peace of mind, and love of which he had thought himself quite incapable. What he has received is a free gift, and yet usually, at least in some small part, he has made himself ready to receive it."
12 & 12, page 106-7, Step 12