Non-existance

The most generalistic definition of existance should be "a being defined by time and space". But what if there was no such time-space in which there could exist movement, cause-effect, sensibility or any of these phenomenons that we connect with our existance? It is hard but not impossible to imagine the lack of time-space, matter, light et cetera. Just lay down on your bed, close your eyes and mentally erase the sounds that flow through the room, erase the lights in the room and after that the darkness in the room, erase the feeling of the bed under you, the sence of clothes, air, itches and so on, erase the taste in your mouth and the smell of the room, erase the feeling of the room, space and your entire beeing. You don´t exist and nothing exists around you. there is no "around you" there is nothing at all and you do not feel it because you don´t even exist. No matter, no hollowness, no light, no darkness - nothing. Not even coldness. No thoughts can occure in a non-timespace-continuum because thoughts occure over a brief period of time. This is the spot (or non-spot) where we must start a discussion over the term "existance".