Awakening is not an experience as such. When you experience something new it is added to your life (life experience). But awakening is definitely not a life experience, it is the opposite of something being added to you, something is being removed, something that was heavy and looked substantial dissolves, it leaves behind something that is not entirely new, but has been obscured before.
Spiritual seekers are looking for a spiritual experience as if it is something that can be added to you. That's not how it is, in that sense it is a negative experience. It's a loss rather than a gain, it's a beautiful loss, but in the transitional moment of loss it can still be painful, because it's a kind of death. So you lose something, but you gain your essential reality, it's not added on. The important thing is not to look for an experience, not to look for an adding onto me, a want to have more experiences ...
It's a big minus-experience, not a plus-experience.
Excerpt from a part of an interview with Eckhart Tolle: Eckhart's Experience of Awakening