Heaven and hell are human allegories for places of joy and punishment, not real places.
The inhabitants of hell could not tolerate the brightness of heaven, anymore than the inhabitants of heaven could stand the darkness of hell.
Therefore, I believe that you make your own heaven or hell in your mind, and while some people enjoy wearing wings and having harp concerts and classic opera in the sky, heaven for a person who likes heavy metal would be hell for others and heaven for those who prefer it.
Non-consciousness or non-existance is the most likely. I do not ever remember dreams, so I conceive of death to be the same as my unconsciousness each night.