Sheol, according to the ancient Hebrews, was a huge underground cavern where the spirits of the dead dwelt. Both the good and the evil went there and they were supposed to have been asleep or barely conscious. Sheol is more accurately translated as the underworld. Hades was the later Greek term used for Sheol.
It is later, in the imaginations of theologians, that the underworld became compartmentalized into Paradise and Gehenna with the righteous and the wicked in their separate suites. The condition of the spirits was also more vivid. There they awaited the resurrection were their immortal spirits would be united with immortal bodies.
Sometime after the New Testament was written the underworld was eliminated and replaced with the current heaven and hell divisions. The resurrection can be considered an anticlimactic event since both sides know that they're going to either roast or dwell in orgasmic bliss through eternity.
Oh I forgot! The evil will suffer even more after the resurrection because they'll have physical bodies to feel the pain even more!
