i think realistically that your ability to percieve goes away, so there is truly nothing, not a lack void, nothing. since you can't perceive or process things anymore, there will be nothing. you can't imagine it because you've never been unable to percieve and process sensory information
however, i like to believe that you get reincarnated in the sense that the "first-person" view you experience right now in your body happens again in another body. you won't remember anything, but the "first-person view" is transferred from your body to someone else's