In ref to both @oendertuerk and @hartnell, before venturing towards an ultimate truth, it needs to be precisely worded - reminds me of the computer in Hitchhiker's Guide. So, if all we experience is our mind, is there any state of mind that is universal, something we can all agree upon? This is not dissimilar to Descartes' meditation, although the answer is different.

There is a state of pure awareness (or consciousness) devoid of any other experience. It is the ground state of consciousness. We don't usually notice it as our attention tends to focus on the phenomena generated by the mind, be they deemed external or internal (the mind doesn't seem to care). It has various names, depending on the language of the texts, but the definitions show such words to be synonyms, and hence the experiences to be the same.

How can one experience a kind of stateless state? What is interesting is that the state has no phenomena that one can point to, and yet the memory of the state remains - it is not a memory-less sleep, it is a conscious state. Indeed, if I was more skillful, and diligent, I should be able to extend such periods of consciousness - so-called sleep yoga claims to have techniques to achieve this.

When one comes out of the pure state, there is an admixture of our standard conscious mental activity with the ground state still present. Mental activities appear with a certain detachment. Without practice, the ground state fades back into the background, yet can be accessed - and it will always be the same state.