In the Superman comic books, how does Superman come back to life after being killed by Doomsday?

This is just one of those moments in Superman lore that is pretty complex to explain....I'll try my best. Keep in mind that this is argued in a lot of forums and while some of my statements could be false, don't label me as completely "incorrect". Feel free to add on to me and/or explain further: Superman had pretty much depleted his extensive solar reserves in the fight against Doomsday (which also involved Doomsday pounding on him pretty damn badly). At the end of it, Supes went into a coma (and then some). If he'd been left out on a rooftop with sunshine beating down on him, maybe he would've recuperated -- but stupid humans that we are, we sealed him into a coffin and sealed the coffin up in a crypt and otherwise cut him off from the stuff that powers his abilities. So, instead, he eventually died; his soul left the weakening comatose body and everything. As it happens, though, Jonathan Kent was having an out-of-body experience right about then as well, and convinced his adopted ...  more